Wonder.

“Wonder acts upon a man like a shock, he is “moved” and “shaken”, and in the dislocation that succeeds all that he had taken for granted as being natural or self-evident loses its compact solidity and obviousness; he is literally dislocated and no longer knows where he is. If this were only to involve the man of action in all of us, so that a man only lost his sense of certainty of everyday life, it would be relatively harmless; but the ground quakes beneath his feet in a far more dangerous sense, and it is his whole spiritual nature, his capacity to know, that is threatened. It is an extremely curious fact that this is the only aspect of wonder, or almost the only aspect, that comes to evidence in modern philosohpy, and the old view that wonder was the beginning of philosophy takes on a new meaning: doubt is the beginning of philosophy. . . . The innermost meaning of wonder is fulfilled in a deepened sense of mystery. It does not end in doubt, but is the awakening of the knowledge that being, qua being, is mysterious and inconceivable, and that it is a mystery in the full sense of the word: neither a dead end, nor a contradiction, nor even something impenetrable and dark. Rather, mystery means that a reality cannot be comprehended because its light is ever-flowing, unfathomable, and inexhaustible. And that is what the wonderer really experiences. . . .
― Josef Pieper, Leisure, the basis of culture, and, The philosophical act!