Thirukkural

எண்ணிய எண்ணியாங்கு எய்துவர் எண்ணியார் திண்ணியர் ஆகப் பெறின்.

Enniya Enniyaangu Eydhu Enniyaar Thinniyar Aakap Perin

If those who have planned (an undertaking) possess firmness (in executing it) they will obtain what they have desired even as they have desired it