Yet ever since the days of Adam, man has been hiding from God and saying, “God is hard to find.” The truth is that, in each heart, there is a secret garden which God made uniquely for Himself. That garden is locked like a safety-deposit vault: it has two keys. God has one key; hence the soul cannot let anyone else in but God. The human heart has the other key; hence not even God can get in without man’s consent. When the two keys of God’s love and human liberty, of Divine Vocation and human response meet, then Paradise returns to a human heart. God is always at that Garden Gate with His key. We pretend to look for our key, to have mislaid it, to have given up the search; but all the while it is in our hand, if we would only see it. The reason we are not as happy as saints is because we do not wish to be saints.
—from Peace of Soul by Venerable Fulton Sheen, Chapter 4: Is God Hard To Find?