For God to prove himself on demand, physically, would be a grave disappointment, and the strongest Christians should be considerably grateful that he chooses not to do so. The skeptic endlessly demands proof, yet God refuses to insult the true intelligence of man, the '6th sense', the chief quality, the acumen which distinguishes man from the rest of creation, faith.
These are the few ways we can practice humility: To speak as little as possible of one's self. To mind one's own business. Not to want to manage other people's affairs. To avoid curiosity. To accept contradictions and correction cheerfully. To pass over the mistakes of others. To accept insults and injuries. To accept being slighted, forgotten and disliked. To be kind and gentle even under provocation. Never to stand on one's dignity. To choose always the hardest.