Make hay while the Sun shines

न कश्चिदपि जानाति
किं कस्य श्वो भविष्यति ।
अतः श्वः करणीयानि
कुर्यादद्यैव बुद्धिमान् ॥

Nobody knows what happens to whom tomorrow. That's why, a wise person should complete tomorrow's duties today itself.

Make hay while the Sun shines.
Never put off till tomorrow what you can do today.