Bhagavad Gita: Chapter 2, Verse 46

यावानर्थ उदपाने सर्वतः सम्प्लुतोदके ।
तावान्सर्वेषु वेदेषु ब्राह्मणस्य विजानतः ॥ २-४६ ॥

yāvān artha uda-pāne sarvataḥ samplutodake
tāvān sarveṣu vedeṣu brāhmaṇasya vijānataḥ 2.46

All the purpose is served by a small well of water is naturally served in all respects by a great reservoir. Similarly, all the purposes of the Vedas can be served to one who knows the Supreme Brahman, who is in complete knowledge.