Dhammapada verses 25 and 26

25. By effort and heedfulness, discipline and self-mastery, let the wise one make for himself an island which no flood can overwhelm.

26. The foolish and ignorant indulge in heedlessness, but the wise one keeps his heedfulness as his best treasure.

– Dhammapada II – Appamadavagga: Heedfulness 25 – 26