Thirukkural 847

அருமறை சோரும் அறிவிலான் செய்யும் பெருமிறை தானே தனக்கு.

Arumurai sorrum arivilan seyyum Perumurai thanai thanakku

The fool who steals the rare knowledge of the wise creates for himself a burden far heavier than what he took. The theft itself becomes his master.