Kural - 704

Who reads what's shown by signs, though words unspoken be,
In form may seem as other men, in function nobler far is he

Explanation
Those who understand one's thoughts without being informed (thereof) and those who do not, may (indeed) resemble one another bodily; still are they different (mentally).

Tamil Transliteration
Kuriththadhu Kooraamaik Kolvaaro Tenai
Uruppo Ranaiyaraal Veru.