Up to a certain point it is good for us to know that there are people in the world who will give us love and unquestioned loyalty to the limit of their ability. I doubt, however, if it is good for us to feel assured of this without the accompanying obligation of having to justify this devotion by our behavior.

Eleanor Roosevelt (1884–1962) First Lady of the US (1933–1945), politician, diplomat, activist

Memoir (1937), This Is My Story, ch. 17 “Readjustment”
    (Source)

The same passage is included in her compiled 1961 Autobiography, Part 1, ch. 10 "Readjustment."