Kural - 453

Perceptions manifold in men are of the mind alone;
The value of the man by his companionship is known

Explanation
The power of knowing is from the mind; (but) his character is from that of his associates.

Tamil Transliteration
Manaththaanaam Maandhark Kunarchchi Inaththaanaam
Innaan Enappatunj Chol.