吃一堑，长一智

A fall into a pit, a gain in your wit.

Wisdom comes by suffering.

The burnt child dreads fire.

By falling we learn to go safely.

Experience bought by suffering teaches widsom.

解释：

吃一堑长一智，本为石匠师傅打石磨时，石胚吃一钎，石胚即长一齿之意。堑：壕沟，比喻困难、挫折。智：智慧，见识。意思是说受到一次挫折，便得到一次教训，增长一分才智。是经过失败取得教训的道理。

出处：

明·王阳明《与薛尚谦书》：“经一蹶者长一智，今日之失，未必不为后日之得。”