He who lives by the crystal ball soon learns to eat ground glass.

Summary

This quote suggests that relying too heavily on predictions and forecasts can lead to disappointment and negative consequences. It implies that promises of a clear future are often unreliable and can be harmful. Depending too much on speculation and trying to predict outcomes can result in disappointment and damage, akin to consuming something as dangerous as ground glass. The quote encourages individuals to live in the present, adapt to uncertainties, and not solely rely on future predictions.