On the battlefield Arjuna could see all kinds of relatives. He could see persons like Bhūriśravā, who were his father's contemporaries, grandfathers Bhīṣma and Somadatta, teachers like Droṇācārya and Kṛpācārya, maternal uncles like Śalya and Śakuni, brothers like Duryodhana, sons like Lakṣmaṇa, friends like Aśvatthāmā, well-wishers like Kṛtavarmā, etc. He could see also the armies which contained many of his friends.
(Bhagavad-Gita----1:26----purport).

Any man who has genuine devotion to the Lord has all the good qualities which are found in godly persons or in the demigods, whereas the nondevotee, however advanced he may be in material qualifications by education and culture, lacks in godly qualities. As such, Arjuna, just after seeing his kinsmen, friends and relatives on the battlefield, was at once overwhelmed by compassion for them who had so decided to fight amongst themselves.
(Bhagavad-Gita----1:28----purport).

As far as his soldiers were concerned, he was sympathetic from the beginning, but he felt compassion even for the soldiers of the opposite party, foreseeing their imminent death. And while he was so thinking, the limbs of his body began to quiver, and his mouth became dry. He was more or less astonished to see their fighting spirit. Practically the whole community, all blood relatives of Arjuna, had come to fight with him. This overwhelmed a kind devotee like Arjuna. Although it is not mentioned here, still one can easily imagine that not only were Arjuna's bodily limbs quivering and his mouth drying up, but he was also crying out of compassion. Such symptoms in Arjuna were not due to weakness but to his softheartedness, a characteristic of a pure devotee of the Lord.
(Bhagavad-Gita----1:28----purport).

There are two kinds of trembling of the body, and two kinds of standings of the hair on end. Such phenomena occur either in great spiritual ecstasy or out of great fear under material conditions. There is no fear in transcendental realization. Arjuna's symptoms in this situation are out of material fear-namely, loss of life. This is evident from other symptoms also; he became so impatient that his famous bow Gāṇḍīva was slipping from his hands, and, because his heart was burning within him, he was feeling a burning sensation of the skin. All these are due to a material conception of life.
(Bhagavad-Gita----1:29----purport).

When a man sees only frustration in his expectations, he thinks, "Why am I here?" Everyone is interested in himself and his own welfare. No one is interested in the Supreme Self. Arjuna is showing ignorance of his real self-interest by Kṛṣṇa's will. One's real self-interest lies in Viṣṇu, or Kṛṣṇa. The conditioned soul forgets this, and therefore suffers material pains. Arjuna thought that his victory in the battle would only be a cause of lamentation for him.
(Bhagavad-Gita----1:30----purport).

Without knowing that one's self-interest is in Viṣṇu (or Kṛṣṇa), conditioned souls are attracted by bodily relationships, hoping to be happy in such situations. In such a blind conception of life, they forget even the causes of material happiness. Arjuna appears to have even forgotten the moral codes for a kṣatriya. It is said that two kinds of men, namely the kṣatriya who dies directly in front of the battlefield under Kṛṣṇa's personal orders and the person in the renounced order of life who is absolutely devoted to spiritual culture, are eligible to enter into the sun globe, which is so powerful and dazzling.
(Bhagavad-Gita----1:31----purport).

Arjuna has addressed Lord Kṛṣṇa as Govinda because Kṛṣṇa is the object of all pleasures for cows and the senses. By using this significant word, Arjuna indicates that Kṛṣṇa should understand what will satisfy Arjuna's senses. But Govinda is not meant for satisfying our senses. If we try to satisfy the senses of Govinda, however, then automatically our own senses are satisfied. Materially, everyone wants to satisfy his senses, and he wants God to be the order supplier for such satisfaction.
(Bhagavad-Gita----1:32-135----purport).

The Lord will satisfy the senses of the living entities as much as they deserve, but not to the extent that they may covet. But when one takes the opposite way—namely, when one tries to satisfy the senses of Govinda without desiring to satisfy one's own senses—then by the grace of Govinda all desires of the living entity are satisfied. Arjuna's deep affection for community and family members is exhibited here partly due to his natural compassion for them. He is therefore not prepared to fight. Everyone wants to show his opulence to friends and relatives, but Arjuna fears that all his relatives and friends will be killed on the battlefield and he will be unable to share his opulence after victory. This is a typical calculation of material life.
(Bhagavad-Gita----1:32-135----purport).

Arjuna considered that rather than kill his own kinsmen for political reasons, it would be better to forgive them on grounds of religion and saintly behavior. He did not, therefore, consider such killing profitable simply for the matter of temporary bodily happiness. After all, kingdoms and pleasures derived therefrom are not permanent, so why should he risk his life and eternal salvation by killing his own kinsmen? Arjuna's addressing of Kṛṣṇa as "Mādhava," or the husband of the goddess of fortune, is also significant in this connection. He wanted to point out to Kṛṣṇa that, as husband of the goddess of fortune, He should not induce Arjuna to take up a matter which would ultimately bring about misfortune. Kṛṣṇa, however, never brings misfortune to anyone, to say nothing of His devotees.
(Bhagavad-Gita----1:36----purport).

A kṣatriya is not supposed to refuse to battle or gamble when he is so invited by some rival party. Under such an obligation, Arjuna could not refuse to fight, because he had been challenged by the party of Duryodhana. In this connection, Arjuna considered that the other party might be blind to the effects of such a challenge. Arjuna, however, could see the evil consequences and could not accept the challenge. Obligation is actually binding when the effect is good, but when the effect is otherwise, then no one can be bound. Considering all these pros and cons, Arjuna decided not to fight.
(Bhagavad-Gita----1:37-138----purport).

Arjuna bases his argument not on his own personal experience, but on what he has heard from the authorities. That is the way of receiving real knowledge. One cannot reach the real point of factual knowledge without being helped by the right person who is already established in that knowledge. There is a system in the varṇāśrama institution by which before death one has to undergo the process of atonement for his sinful activities. One who is always engaged in sinful activities must utilize the process of atonement called the prāyaścitta. Without doing so, one surely will be transferred to hellish planets to undergo miserable lives as the result of sinful activities.
(Bhagavad-Gita----1:43----purport).

Driven by selfish motives, one may be inclined to such sinful acts as the killing of one's own brother, father or mother. There are many such instances in the history of the world. But Arjuna, being a saintly devotee of the Lord, is always conscious of moral principles and therefore takes care to avoid such activities.
(Bhagavad-Gita----1:44----purport).

Material compassion, lamentation and tears are all signs of ignorance of the real self. Compassion for the eternal soul is self-realization. The word "Madhusūdana" is significant in this verse. Lord Kṛṣṇa killed the demon Madhu, and now Arjuna wanted Kṛṣṇa to kill the demon of misunderstanding that had overtaken him in the discharge of his duty. No one knows where compassion should be applied. Compassion for the dress of a drowning man is senseless.
(Bhagavad-Gita----2:1----purport).

Persons who are led by the material conception of life do not know that the aim of life is realization of the Absolute Truth, Viṣṇu, or Bhagavān, and they are captivated by the external features of the material world, and therefore they do not know what liberation is. Persons who have no knowledge of liberation from material bondage are called non-Āryans. Although Arjuna was a kṣatriya, he was deviating from his prescribed duties by declining to fight. This act of cowardice is described as befitting the non-Āryans. Such deviation from duty does not help one in the progress of spiritual life, nor does it even give one the opportunity to become famous in this world. Lord Kṛṣṇa did not approve of the so-called compassion ofArjuna for his kinsmen.
(Bhagavad-Gita----2:2----purport).

Arjuna was addressed as the son of Pṛthā, who happened to be the sister of Kṛṣṇa's father Vasudeva. Therefore Arjuna had a blood relationship with Kṛṣṇa. If the son of a kṣatriya declines to fight, he is a kṣatriya in name only, and if the son of a brāhmaṇa acts impiously, he is a brāhmaṇa in name only. Such kṣatriyas and brāhmaṇas are unworthy sons of their fathers; therefore, Kṛṣṇa did not want Arjuna to become an unworthy son of a kṣatriya.
(Bhagavad-Gita----2:3----purport).