Kural - 877

To those who know them not, complain not of your woes;
Nor to your foeman's eyes infirmities disclose

Explanation
Relate not your suffering even to friends who are ignorant of it, nor refer to your weakness in the presence of your foes.

Tamil Transliteration
Novarka Nondhadhu Ariyaarkku Mevarka
Menmai Pakaivar Akaththu.