The brahmin Saṅgārava believes ritually bathing in water washes away wrongdoings. The Buddha corrects him, teaching that the Dhamma is the true tranquil lake with banks of ethical conduct, where the wise bathe to safely cross to the far shore.

The Buddha explains to the brahmin Saṅgārava why memorized mantras are sometimes forgotten. Using metaphors of water that is dyed, boiling, overgrown, rippling, or muddy, he illustrates how the five hindrances cloud the mind.