Raw reference: nos. 32-34
CCC 32
The world: starting from
The world: starting from movement, becoming, contingency, and the world's order and beauty, one can come to a knowledge of God as the origin and the end of the universe.
CCC 33
The human person: with his
The human person: with his openness to truth and beauty, his sense of moral goodness, his freedom and the voice of his conscience, with his longings for the infinite and for happiness, man questions himself about God's existence. In all this he discerns signs of his spiritual soul. the soul, the "seed of eternity we bear in ourselves, irreducible to the merely material", [GS 18 # 1; cf. 14 # 2.] can have its origin only in God.
CCC 34
The world, and man, attest
The world, and man, attest that they contain within themselves neither their first principle nor their final end, but rather that they participate in Being itself, which alone is without origin or end. Thus, in different ways, man can come to know that there exists a reality which is the first cause and final end of all things, a reality "that everyone calls God". [St. Thomas Aquinas, S Th I, 2, 3.]