ஆழமான தண்ணீர் அமைதியாக ஓடும்
Aazhamaana thanneer amaidhiyaaga odum
Meaning
Deep water flows calmly and silently; it's the shallow stream that rushes past with the loudest noise - true depth of character rarely needs to announce itself.
Story
On a mountain trail were two streams - one deep and calm, the other shallow, clattering noisily over rocks. A traveller was drawn at first to the noisy shallow one, but it was the quiet, deep stream that actually quenched his thirst.
Reader's Note
Don't mistake quietness for a lack of depth - the two rarely mean the same thing.