There is a type of person who cannot find certitude and God: the person who is unaware that he is a sinner. He admits social sin, but not individual. There are complexes but not guilt. If he admits to having done wrong, it was a mistake, not a sin, for sin is not part of his vocabulary. He may admit to needing a therapist, but not a Saviour. His wrongs are due to other people, his family, his associates, his society.
This type of person will sometimes openly assert that he does not need a God. Money, friends and pleasures are available in abundance: clothes and cars, dining and drinking, sex and drugs, sports and recreation, prestige and power. Who needs more? Who needs God? Who needs salvation? This person is uninterested in ideals like truth and goodness. He does not see because he does not want to see. And so he claims there is nothing to see.
One day this individual finds that he has been living in a world of fantasy.
It is the day when tragedy strikes. It may be a death or the loss of money or power or prestige. A friend may have betrayed him. Or it may be that suddenly he is the victim of a brutal crime or he finds himself wasting away with a gnawing cancer.
He may respond to the touch of grace and return like the prodigal, but he may also give way to despair if not suicide. But in any case he now knows that he needs far more than power or prestige or sex or money.
This may be the moment of truth. Hitting rock bottom can be powerful eye opener. He may now see that indeed he is a sinner and that he drastically needs a Saviour. The scales may have fallen from the eyes of his mind and he may be prepared to see objective evidence for the first time.
He may be ready to love and see.