The nature of human life is that man has a perishable body, but an immortal soul as one complete human person. Each human has an intellect that seeks truth, a will that seeks goodness and a heart that seeks love. The infinite horizon of the human mind means humans are open to the infinite and therefore religious by nature and so have a natural desire for God, who alone can fulfil humanity.
“two fundamental truths should be kept in mind: first, that man is called to live in truth and love; and second, that everyone finds fulfilment through the sincere gift of self.” (John Paul II, Letter to Families)
“Our hearts are restless until they rest in God” (St. Augustine)
“There is a God shaped vacuum in the heart of every man which cannot be filled by any created thing, but only God, the Creator, made known through Jesus.” Blaise Pascal.
"If I find in myself a desire which no experience in this world can satisfy, the most probable explanation is that I was made for another world." - C.S. Lewis