Age is foolish and forgetful when it underestimates youth. - J. K. Rowling
If the storm underestimates your power, nothing happens to him; but if you underestimate the power of the storm, you sink! - Mehmet Murat ildan
Who underestimates is buried in the optimism of the deads. (Qui sous-estime s'enterre - Dans l'optimisme des morts.) - Charles de Leusse