Bhagavad Gita · Chapter 2: The Path of Understanding
Bhagavad Gita 2.40
नेहाभिक्रमनाशोऽस्ति प्रत्यवायो न विद्यते ।
स्वल्पमप्यस्य धर्मस्य त्रायते महतो भयात् ॥
nehābhikramanāśo'sti pratyavāyo na vidyate | svalpamapyasya dharmasya trāyate mahato bhayāt ||
On this path no effort is ever lost, and no harm comes of it. Even a little of this practice protects one from great fear.
Modern context
On this path no effort is wasted and none does harm. A business abandoned halfway is a loss; a ritual done wrongly was thought to backfire. Inner practice is different: whatever you do counts, and stays yours. For anyone put off by the thought 'I cannot do it perfectly', this is one of the most encouraging verses in the Gita.