True wisdom is less presuming than folly. The wise man doubteth often, and changeth his mind; the fool is obstinate, and doubteth not; he knoweth all things but his own ignorance.

Meaning: Someone's belief may have been produced by what they want to be true, rather than by good evidence that it is true.

Meaning: A request made at a higher level leaves room to reduce it later. The saying describes flexibility in an opening demand, while its advice needs limits: an inflated request can undermine trust or ignore what the other person can reasonably offer.

Meaning: An outward container does not establish the quality of what is inside. Look for evidence about the substance rather than relying on packaging, appearance or a reassuring presentation.

Meaning: The phrase rejects a claim as implausible, suggesting that the speaker feels someone is asking too much of their belief. A strong expression of doubt still needs reasons when the actual claim matters.