Thomas Merton said this quote

There is something in the depths of our being that hungers for wholeness and finality. Because we are made for eternal life, we are made for an act that gathers up all the powers and capacities of our being and offers them simultaneously and forever to God. The blind spiritual instinct that tells us obscurely that our owns lives have a particular importance and purpose, and which urges us to find out our vocation, seeks in so doing to bring us to a decision that will dedicate our lives irrevocably to their true purpose. The man who loses this sense of his own personal destiny, and who renounces all hope of having any kind of vocation in life has either lost all hope of happiness or else has entered upon some mysterious vocation that God alone can understand.