Thirukkural 375

நல்லவை எல்லாஅந் தீயவாம் தீயவும் நல்லவாம் செல்வம் செயற்கு.

Nallavaí ellaam theeyavaam theeyavum nallavaum selvam seyarku.

Good deeds become harmful, and harmful deeds become noble, when wealth commands them. The instrument determines the act, not the act itself.