One verse

Bhagavad Gita 2.46

2.46

यावानर्थ उदपाने सर्वतः सम्प्लुतोदके | तावान्सर्वेषु वेदेषु ब्राह्मणस्य विजानतः ||२-४६||

yāvānartha udapāne sarvataḥ samplutodake . tāvānsarveṣu vedeṣu brāhmaṇasya vijānataḥ ||2-46||

yāvān
all that
arthaḥ
is meant
uda-pāne
in a well of water
sarvataḥ
in all respects
sampluta-udake
in a great reservoir of water
tāvān
similarly
sarveṣu
in all
vedeṣu
Vedic literatures
brāhmaṇasya
of the man who knows the Supreme Brahman
vijānataḥ
who is in complete knowledge

All purposes served by a small well can at once be served by a great reservoir of water. Similarly, all the purposes of the Vedas can be served to one who knows the purpose behind them.