Brahma Sutras
ॐ आनर्थक्यमिति चेन्न तदपेक्षत्वात् ॐ ॥ ३-१-१०॥
If it be objected that (in that case) conduct will cease to have any usefulness, then it is not so, because karma is dependent on that conduct.
english translation
OM Anarthakyamiti cenna tadapekSatvAt OM ॥ 3-1-10॥
hk transliteration by Sanscript