Moreover, he knows by experience that there is always a reason for my slightest questions, though he may not… — Jean Jacques Rousseau

Moreover, he knows by experience that there is always a reason for my slightest questions, though he may not see it at once; so he has not got into the habit of giving silly answers; on the contrary, he is on his guard, he considers things carefully and attentively before answering. He never gives me an answer unless he is satisfied with it himself, and he is hard to please. Lastly we neither of us take any pride in merely knowing a thing, but only in avoiding mistakes. We should be more ashamed to deceive ourselves with bad reasoning, than to find no explanation at all. There is no phrase so appropriate to us, or so often on our lips, as, "I do not know;" neither of us are ashamed to use it. But whether he gives the silly answer or whether he avoids it by our convenient phrase "I do not know," my answer is the same. "Let us examine it."

Source: Wikiquote · CC BY-SA 4.0