Thirukkural-On Wealth-On Listening To The Wise-Kural-416

Enaithaanum nallavai kaetka anaiththaanum
Andra perumai tharum

Even if it is just a little, listen and assimilate good instruction,
It will be productive of great benefit

On this, Rajaji would comment that Valluvar has expressed this as a piece of consolation to those who feel frustrated at having to do all their learning only through listening.

It is a well known proverb in Tamil that few drops of water finally make up a flood.
“Siru thuli peru vellam"

The Bible too concedes that

“A wise man"s tongue spreads knowledge".
(Proverb, 15:2)

the Koran speaks of the possibility of taking away your hearing as something that upsets and ruins your whole life. Such is the importance of the acquisition of knowledge through the ear (Koran 6,47)