This quotation can be viewed in the context of a book
"Happiness comes of the capacity to feel deeply, to enjoy simply, to think freely, to risk life, to be needed. which give happiness. Thomas Jefferson We never enjoy perfect happiness; our most fortunate successes are mingled with sadness; some anxieties always perplex the reality of our satisfaction."
"Only to the extent that someone is living out this self transcendence of human existence, is he truly human or does he become his true self. He becomes so, not by concerning himself with his self's actualization, but by forgetting himself and giving himself, overlooking himself and focusing outward."