Kalama Sutra

Kalamas, whenever you yourselves know that these things are unwholesome; these things are harmful; these things are criticized by the wise; and when practiced according to their own standard, these things bring suffering and have no benefit, then you ought to abandon such things.

The Kalama Sutra recounts Buddha’s interaction with the Kalama clan who brought questions to him. There were many holy men who traveled throughout the land proclaiming their views and decrying the teachings of others; the people asked the Buddha how they were to know which teaching to follow. His sermon offered a clear guideline and encouragement to see for oneself.

The Daily Zen Teisho
Kalama Sutra