கல்லாத மேற்கொண் டொழுகல் கசடற வல்லதூஉம் ஐயம் தரும்.

Kallaadha Merkon Tozhukal Kasatara Valladhooum Aiyam Tharum

If men what they have never learned assume to know, Upon their real learning's power a doubt 'twill throw

Thirukkural · Kural 845