The works of Ādi Śaṅkarācārya

Svātmaprakāśikā

Verse 53

स्वल्पापि दीपकणिका बहुलं नाशयेत्तमः ।स्वल्पोऽपि बोधो महतीमविद्यां शमयेत्तथा ॥ ५० ॥

In plain words

One small spark of lamplight puts out a whole room of darkness. In just the same way, even a little real knowing puts out an avidyā that looked immense.

Close to the Sanskrit

Even a very small spark of a lamp would destroy abundant darkness; so too even a slight knowing would quell vast avidyā.