A few of a devotee's qualifications are further being described. No one is put into difficulty, anxiety, fearfulness or dissatisfaction by such a devotee. Since a devotee is kind to everyone, he does not act in such a way as to put others into anxiety. At the same time, if others try to put a devotee into anxiety, he is not disturbed. It is by the grace of the Lord that he is so practiced that he is not disturbed by any outward disturbance.
(Bhagavad-Gita---12:15---purport).

Bhava, birth, should be understood to refer to the body. As far as the soul is concerned, there is neither birth nor death; that we have discussed in the beginning of Bhagavad-gītā. Birth and death apply to one's embodiment in the material world. Fear is due to worrying about the future. A person in Kṛṣṇa consciousness has no fear because by his activities he is sure to go back to the spiritual sky, back home, back to Godhead. Therefore his future is very bright. Others, however, do not know what their future holds; they have no knowledge of what the next life holds. So they are therefore in constant anxiety. If we want to get free from anxiety, then the best course is to understand Kṛṣṇa and be situated always in Kṛṣṇa consciousness.
(Bhagavad-Gita---10:4-5---purport).

The difference between a person in Kṛṣṇa consciousness and a person in bodily consciousness is that the former is attached to Kṛṣṇa whereas the latter is attached to the results of his activities. The person who is attached to Kṛṣṇa and works for Him only is certainly a liberated person, and he has no anxiety over the results of his work. In the Bhāgavatam, the cause of anxiety over the result of an activity is explained as being one's functioning in the conception of duality, that is, without knowledge of the Absolute Truth.
(Bhagavad-Gita---5:12---purport).

"Although the two birds are in the same tree, the eating bird is fully engrossed with anxiety and moroseness as the enjoyer of the fruits of the tree. But if in some way or other he turns his face to his friend who is the Lord and knows His glories—at once the suffering bird becomes free from all anxieties." Arjuna has now turned his face towards his eternal friend, Kṛṣṇa, and is understanding the Bhagavad-gītā from Him. And thus, hearing from Kṛṣṇa, he can understand the supreme glories of the Lord and be free from lamentation.
(Bhagavad-Gita---2:22---purport).