Kural - 923

The drunkard's joy is sorrow to his mother's eyes;
What must it be in presence of the truly wise

Explanation
Intoxication is painful even in the presence of (one's) mother; what will it not then be in that of the wise ?.

Tamil Transliteration
Eendraal Mukaththeyum Innaadhaal Enmatruch
Chaandror Mukaththuk Kali.