Men have often tried to give itemized accounts of why they must believe that God exists. Such accounts are like ripe fruit we gather from the trees. Yet it is beyond all reasons, beneath the ground, where a seed starts to become a tree, that the act of faith takes place.
The soul rarely knows how to raise its deeper secrets to discursive levels of the mind. We must not, therefore, equate the act of faith with its expression. The expression of faith is an affirmation of truth, a definite judgment, a conviction, while faith itself is an event, something that happens rather than something that is stored away; it is a moment in which the soul of man communes with the glory of God...
For God is not always silent, and man is not always blind. His glory fills the world; His spirit hovers above the waters. There are moments in which, to use a Talmudic phrase, heaven and earth kiss each other; in which there is a lifting of the veil at the horizon of the known, opening a vision of what is eternal in time... The voice of Sinai goes on for ever (5 Mos 5:19): "These words the Lord spoke unto all your assembly in the mount of of the midst of the fire, of the cloud, and of the thick darkness, with a great voice that goes on for ever."

- Abraham Joshua Heschel, God in Search of Man, sid. 138