Dhammapada verses 31 and 32

31. The monk who delights in heedfulness and looks with fear at heedlessness advances like fire, burning all fetters, small and large.

32. The monk who delights in heedfulness and looks with fear at heedlessness will not fall. He is close to Nibbana.

– Dhammapada II – Appamadavagga: Heedfulness 31 – 32