他有一个清白的良心，因为他总是尽力做正确的事情。

He has a clear conscience because he always tries to do the right thing.

我羡慕你平静的心境，清白的良心、纯洁的记忆。

I envy you your peace of mind, your clean conscience, your unpolluted memory.

让我们经常有一件干净的衬衫，一颗清白的良心，口袋里常有一枚金币。

Heres that we may always have a clean shirt, a clean conscience and a guinea in our pocket.