“Feelings of love and gratitude arise directly and spontaneously in the baby in response to the love and care of his mother.”

Our Christ : The Revolt of the Mystical Genius (1921)

Variant: It's one thing to fall in love. It's another to feel someone else fall in love with you, and to feel a responsibility toward that love.
Source: Every Day

Source: The War of Art: Break Through the Blocks & Win Your Inner Creative Battles

Source: Communion: The Female Search for Love

Original: La vera amicizia è quel sentimento in cui ci si vuol bene, si ha fiducia e nascono spontanei sorrisi.
Source: prevale.net

Source: Man for Himself (1947), Ch. 3; in Ch. 2 of his later work The Art of Loving (1956) a similar statement is made :
Context: Care and responsibility are constituent elements of love, but without respect for and knowledge of the beloved person, love deteriorates into domination and possessiveness. Respect is not fear and awe; it denotes, in accordance with the root of the word (respicere = to look at), the ability to see a person as he is, to be aware of his individuality and uniqueness. To respect a person is not possible without knowing him; care and responsibilty would be blind if they were not guided by the knowledge of the person's individuality.

Source: Facets of a Diamond: Reflections of a Healer (2002), p. 269

July 1890, page 315
John of the Mountains, 1938

All and Everything: Beelzebub's Tales to His Grandson (1950)