Dhammapada · 3.6
Anavaṭṭhitacittassa, saddhammaṃ avijānato;Pariplavapasādassa, paññā na paripūrati.
anavatthita-cittassa, saddhammam avijanato; pariplava-pasadassa, panna na paripurati.
With an unsteady mind, not knowing the True Dhamma, with wavering confidence, wisdom does not become full.
— Dhammapada 3.6
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.