On Faith 
What of faith? What of fidelity and loyalty? Complete trust? Faith is not granted by tangible proof. It comes from the heart and soul. If a person needs proof of God's existence, then the very notion of spirituality is diminished into sensuality, and we have reduced what is holy into what is logical. 
I'll not argue against one who has claimed to have seen proof, because that person will not understand that the mere presence of such proof undermines the very purpose of, and value of faith. Because if God were so tangible, so accessible, then we would no longer be independent creatures set on a journey to find the truth, but merely a herd of sheep needing the guidance of a shepherd and his dogs, unthinking and without the essence of faith. 
The guidance is there, I know. Not in such tangible form, but in what we know to be right. It is our own reactions to the acts of others that show us the value of our own actions, and if we have fallen so far as to need an undeniable manifestation of God to show us our way, then we are pitiful creatures indeed.