Viktor E. Frankl said this quote

By declaring that man is responsible and must actualize the potential meaning of his life, I wish to stress that the true meaning of life is to be discovered in the world rather than within man or his own psyche, as though it were a closed system. I have termed this constitutive characteristic the self-transcendence of human existence. It denotes the fact that being human always points, and is directed, to something or someone, other than oneself--be it a meaning to fulfill or another human being to encounter. The more one forgets himself--by giving himself to a cause to serve or another person to love--the more human he is and the more he actualizes himself. What is called self-actualization is not an attainable aim at all, for the simple reason that the more one would strive for it, the more he would miss it. In other words, self-actualization is possible only as a side-effect of self-transcendence.