问心无愧 ---------- feel no qualms upon self-examination

例句：
A: Jack's face showed guilt.
杰克的脸上流露出内疚的神情。
B: If he were a just and fair man, he would felt no qualms upon self-examination.
如果他是一位公正磊落的男人，他就会问心无愧。

同义词：
have a clear conscience