Bhagavad Gita 2.46
यावानर्थ उदपाने सर्वतः संप्लुतोदके।
तावान्सर्वेषु वेदेषु ब्राह्मणस्य विजानतः।।2.46।।
Yavanartha udapane sarvatah samplutodake
Tavansarveshu vedeshu brahmanasya vijanatah
Simple meaning, written by AIJust as a small well is useful only as much as a large flood of water everywhere, so is the use of all the Vedas for a Brahmin who knows the truth.