Bhagavad Gita 2.40

On this path, endeavour is never wasted nor repressed. Even a little practice of it protects one from great danger.

नेहाभिक्रमनाशोऽस्ति प्रत्यवायो न विद्यते।
स्वल्पमप्यस्य धर्मस्य त्रायते महतो भयात्॥

nehābhikramanāśo'sti pratyavāyo na vidyate|
svalpamapyasya dharmasya trāyate mahato bhayāt||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).