What if he got a guilty conscience and brought it back?

如果他问心有愧把它带回来呢？

《柯林斯英汉双解大词典》

For some others it was little more than an attempt to assuage a guilty conscience.

对于其他一些人来说，不过是减缓自己负罪感的一次尝试。

youdao

Very few games will make you think about your actions and play on your guilty conscience the way Fable 3 does.

很少有游戏会像《神鬼寓言》系列那样会让你仔细思考要采取的每一步行动。

youdao

Americans, perhaps because they have a guilty conscience, think of the IRS as being omniscient.

CNN: An Overtaxed IRS

For an eater suffering from a guilty conscience, a spoonful of vitamins makes the fattening food go down.

FORBES: Fructose Nation

The plaintiffs also have to show executives acted with scienter, or guilty conscience.

FORBES: Confidential Witnesses Can't Save $100 Billion Wachovia Lawsuit