Source: This quote is from “The Grass Harp” (1951) is a novel by Truman Capote.

Complete Quote: We are speaking of love. A leaf, a handful of seed – begin with these, learn a little what it is to love. First a leaf, a fall of rain, then someone to receive what a leaf has taught you, what a fall of rain has ripened. No easy process, understand; it could take a lifetime, it has mine, and still I’ve never mastered it – I only know how true it is; that love is a chain of love, as nature is a chain of life.