Kural - 485

Who think the pendant world itself to subjugate,
With mind unruffled for the fitting time must wait

Explanation
They who thoughtfully consider and wait for the (right) time (for action), may successfully meditate (the conquest of) the world.

Tamil Transliteration
Kaalam Karudhi Iruppar Kalangaadhu
Gnaalam Karudhu Pavar.