To know one's constitutional position means to know also the sublime position of the Lord. One who wrongly thinks that the living entity's position and the Lord's position are on the same level is to be understood to be in darkness and therefore unable to engage himself in the devotional service of the Lord.
(Bhagavad-Gita----2:51----purport).

By the process of devotional service, one can revive that svarūpa, and that stage is called svarūpa-siddhi—perfection of one's constitutional position. So Arjuna was a devotee, and he was in touch with the Supreme Lord in friendship.
(Bhagavad-Gita---introduction).

One who has actually come to understand one's constitutional position as an eternal servitor of the Lord gives up all engagements save working in Kṛṣṇa consciousness.
(Bhagavad-Gita----2:49----purport).

Since time immemorial each living entity has accumulated the various reactions of his good and bad work. As such, he is continuously ignorant of his real constitutional position. One's ignorance can be removed by the instruction of the Bhagavad-gītā, which teaches one to surrender unto Lord Śrī Kṛṣṇa in all respects and become liberated from the chained victimization of action and reaction, birth after birth.
(Bhagavad-Gita----2:50----purport).

The miseries of life, namely birth, death, old age and diseases, are present everywhere within the material world. But one who understands his real constitutional position as the eternal servitor of the Lord, and thus knows the position of the Personality of Godhead, engages himself in the transcendental loving service of the Lord.
(Bhagavad-Gita----2:51----purport).

The Lord instructs that one has to become fully Kṛṣṇa conscious to discharge duties, as if in military discipline. Such an injunction may make things a little difficult; nevertheless duties must be carried out, with dependence on Kṛṣṇa, because that is the constitutional position of the living entity. The living entity cannot be happy independent of the cooperation of the Supreme Lord, because the eternal constitutional position of the living entity is to become subordinate to the desires of the Lord.
(Bhagavad-Gita----3:30----purport).

In the Kaṭha Upaniṣad the soul has been described as mahān, the great. Therefore the soul is above all-namely, the sense objects, the senses, the mind and the intelligence. Therefore, directly understanding the constitutional position of the soul is the solution of the whole problem. With intelligence one has to seek out the constitutional position of the soul and then engage the mind always in Kṛṣṇa consciousness. That solves the whole problem.
(Bhagavad-Gita----3:32----purport).

Because the person in Kṛṣṇa consciousness is devoid of all kinds of sense-gratificatory propensities, it is to be understood that he has burned up the reactions of his work by perfect knowledge of his constitutional position as the eternal servitor of the Supreme Personality of Godhead.
(Bhagavad-Gita----4:19----purport).

Becoming fully Kṛṣṇa conscious, one is freed from all dualities and thus is free from the contaminations of the material modes. He can become liberated because he knows his constitutional position in relationship with Kṛṣṇa, and thus his mind cannot be drawn from Kṛṣṇa consciousness.
(Bhagavad-Gita----4:23----purport).

Liberation means to be situated in one's constitutional position as an eternal servitor of Kṛṣṇa (Kṛṣṇa consciousness).
(Bhagavad-Gita----4:35----purport).

Proper understanding of one's constitutional position in relationship to Kṛṣṇa is so nice that it can at once lift one from the struggle for existence which goes on in the ocean of nescience.
(Bhagavad-Gita----4:36----purport).

There are many stages of reaction: reaction in the making, reaction fructifying, reaction already achieved, and reaction a priori. But knowledge of the constitutional position of the living entity burns everything to ashes. When one is in complete knowledge, all reactions, both a priori and a posteriori, are consumed.
(Bhagavad-Gita----4:37----purport).

When we come to spiritual activities, we find that these are also divided into two: namely, understanding of one's own self (or one's constitutional position), and the truth regarding the Supreme Personality of Godhead. One who follows the path of Bhagavad-gītā as it is can very easily understand these two important divisions of spiritual knowledge.
(Bhagavad-Gita----4:42----purport).

One who is fully in Kṛṣṇa consciousness is always a renouncer because he feels neither hatred nor desire for the results of his actions. Such a renouncer, dedicated to the transcendental loving service of the Lord, is fully qualified in knowledge because he knows his constitutional position in his relationship with Kṛṣṇa.
(Bhagavad-Gita----5:3----purport).

The symptoms of the self-realized person are given herein. The first symptom is that he is not illusioned by the false identification of the body with his true self. He knows perfectly well that he is not this body, but is the fragmental portion of the Supreme Personality of Godhead. He is therefore not joyful in achieving something, nor does he lament in losing anything which is related to his body. This steadiness of mind is called sthira-buddhi, or self-intelligence. He is therefore never bewildered by mistaking the gross body for the soul, nor does he accept the body as permanent and disregard the existence of the soul. This knowledge elevates him to the station of knowing the complete science of the Absolute Truth, namely Brahman, Paramātmā and Bhagavān. He thus knows his constitutional position perfectly well, without falsely trying to become one with the Supreme in all respects. This is called Brahman realization, or self-realization. Such steady consciousness is called Kṛṣṇa consciousness.
(Bhagavad-Gita----5:20----purport).

Real sannyāsa-yoga or bhakti means that one should know his constitutional position as the living entity, and act accordingly. The living entity has no separate independent identity. He is the marginal energy of the Supreme. When he is entrapped by material energy, he is conditioned, and when he is Kṛṣṇa conscious, or aware of the spiritual energy, then he is in his real and natural state of life.
(Bhagavad-Gita----6:2----purport).

The constitutional position of the living entity is to carry out the order of the superior. As long as one's mind remains an unconquered enemy, one has to serve the dictations of lust, anger, avarice, illusion, etc. But when the mind is conquered, one voluntarily agrees to abide by the dictation of the Personality of Godhead, who is situated within the heart of everyone as Paramātmā.
(Bhagavad-Gita----6:6----purport).

Self-realization means knowing one's constitutional position in relationship to the Supreme. The individual soul is part and parcel of the Supreme, and his position is to render transcendental service to the Lord. This transcendental contact with the Supreme is called brahma-saṁsparśa.
(Bhagavad-Gita----6:28----purport).

The path of self-realization or mysticism is described in the Bhagavad-gītā. The basic principle of self-realization is knowledge that the living entity is not this material body but that he is different from it and that his happiness is in eternal life, bliss and knowledge. These are transcendental, beyond both body and mind. Self-realization is sought by the path of knowledge, by the practice of the eightfold system or by bhakti-yoga. In each of these processes one has to realize the constitutional position of the living entity, his relationship with God, and the activities whereby he can reestablish the lost link and achieve the highest perfectional stage of Kṛṣṇa consciousness.
(Bhagavad-Gita----6:37----purport).

Every living entity is part and parcel of the Supreme Personality of Godhead, and thus every living entity is intended to serve the Supreme Lord by his own constitution. Failing to do this, he falls down. The Bhāgavatam (11.5.3) confirms this as follows:
ya eṣāṁ puruṣaṁ sākṣād
ātma-prabhavam īśvaram
na bhajanty avajānanti
sthānād bhraṣṭāḥ patanty adhaḥ
"Anyone who does not render service and neglects his duty unto the primeval Lord, who is the source of all living entities, will certainly fall down from his constitutional position."
(Bhagavad-Gita----6:47----purport).