反省

In a sentence

• 彼は自分の行動を深く反省している。

  He is deeply reflecting on his actions.

  In this sentence, "反省" means reflecting critically on one's behavior to understand one's mistakes.

• 反省することは自己改善への第一歩だ。

  To reflect is the first step towards self-improvement.

  Here, "反省" is presented as an action that leads to personal growth and understanding.

• 彼女は失敗を反省して、同じ間違いを繰り返さないようにした。

  She reflected on her failure and ensured she would not repeat the same mistake.

  This use of "反省" conveys learning from a past mistake to avoid repeating it in the future.