“前事不忘，后事之师” 用英语怎么讲？

The remembrance of the past is the teacher of the future.

Past experience,if not forgotten,is a guide for the future

Calamity has been my teacher.

Today is yesterday's pupil.

前事(ぜんじ)の忘(わす)れざるは后事(こうじ)の师(し)なり。