குடம் நிறைந்தால் ஓசை இல்லை, குடம் குறைந்தால் ஓசை அதிகம்
Kudam niraindhaal osai illai, kudam kuraindhaal osai adhigam
Meaning
A full pot makes no sound even when carried; a half-empty one sloshes loudly - those who truly know stay quiet, while shallow knowledge talks the loudest.
Story
In a village lived two scholars. One constantly spoke of his own learning. The other rarely spoke, but when he did, the whole village fell silent to listen. A child watching this remembered her grandmother's words: "a full pot never rattles."
Reader's Note
Quietness isn't ignorance - sometimes it's the sign of real depth.