It is a human nature to think wisely and act foolishly.

The line points to a familiar gap between human judgment and human behavior: people can recognize what is prudent, ethical, or rational, yet still choose (or drift into) actions that contradict that knowledge. Read in the spirit of Anatole France’s skeptical, ironic moral vision, it suggests that folly is not merely ignorance but a persistent feature of character, impulse, and circumstance. The quote also implies a quiet humility: wisdom in thought does not guarantee wisdom in practice, so moral life requires more than insight—it requires discipline, self-knowledge, and conditions that support acting on what one knows.