Beware! Walk not with the ungodly and seek not fellowship with him, for such companionship turneth the radiance of the heart into infernal fire.

Bahá’u’lláh, The Persian Hidden Words 57

He that seeketh to commune with God, let him betake himself to the companionship of His loved ones; and he that desireth to hearken unto the word of God, let him give ear to the words of His chosen ones.

Bahá’u’lláh, The Persian Hidden Words 56

The company of the ungodly increaseth sorrow, whilst fellowship with the righteous cleanseth the rust from off the heart.

Bahá’u’lláh, The Persian Hidden Words 56

Treasure the companionship of the righteous and eschew all fellowship with the ungodly.

Bahá’u’lláh, Hidden Words, Persian 3

. . . the human body, all the members of which are connected and linked with one another with the greatest strength. How much the organs, the members and the parts of the body of man are intermingled and connected for mutual aid and help, and how much they influence one another!

‘Abdu’l-Bahá, Some Answered Questions, p. 244

The beings, whether great or small, are connected with one another by the perfect wisdom of God, and affect and influence one another. If it were not so, in the universal system and the general arrangement of existence, there would be disorder and imperfection. But as beings are connected one with another with the greatest strength, they are in order in their places and perfect. This subject is worthy of examination.

‘Abdu’l-Bahá, Some Answered Questions, p. 246