One verse

Srimad Bhagavatam 11.3.29

11.3.29

एवं कृष्णात्मनाथेषु मनुष्येषु च सौहृदम् । परिचर्यां चोभयत्र महत्सु नृषु साधुषु ॥ २९ ॥

evaṁ kṛṣṇātma-nātheṣu manuṣyeṣu ca sauhṛdam paricaryāṁ cobhayatra mahatsu nṛṣu sādhuṣu

evam
thus
kṛṣṇa-ātma-nātheṣu
for those who take Lord Kṛṣṇa as the Lord of their soul
manuṣyeṣu
humans
ca
and
sauhṛdam
friendship
paricaryām
service
ca
and
ubhayatra
rendered to both (moving and nonmoving creatures, or the Lord and His devotees)
mahatsu
(especially) to the pure devotees of the Lord
nṛṣu
to human beings
sādhuṣu
those who are fixed in saintly behavior

One who desires his ultimate self-interest should cultivate friendship with those persons who have accepted Kṛṣṇa as the Lord of their life. One should further develop an attitude of service toward all living beings. One should especially try to help those in the human form of life and, among them, especially those who accept the principles of religious behavior. Among religious persons, one should especially render service to the pure devotees of the Supreme Personality of Godhead.