Don't obtain wealth at the expense of your conscience.

良心を犠牲にして富を得るな。

Tanaka Corpus

He became a brilliant scholar but only at the expense of his health.

彼は優れた学者になりはしたが健康を害してしまった。

Tanaka Corpus

He performed his duty at the expense of his time.

彼は自分の時間を犠牲にして義務を果たした。

Tanaka Corpus