Dhammapada · 6.7

Yathāpi rahado gambhīro, vippasanno anāvilo;Evaṃ dhammāni sutvāna, vippasīdanti paṇḍitā.

Yathapi rahado gambhiro, vippasanno anavilo; Evam dhammani sutvana, vippasidanti pandita.

As a deep lake is clear and undisturbed, so the wise become serene upon hearing the teachings.

— Dhammapada 6.7

Source: Pali text from the Khuddaka Nikāya of the Pali Canon (oldest extant Buddhist scripture, compiled c. 3rd century BCE). Public-domain English readings drawn from F. Max Müller's translation in Sacred Books of the East, Vol X (1881) and the Buddhist Publication Society's freely-licensed Acharya Buddharakkhita rendering.