Mahabharata 12.252.5

सदाचारो मतो धर्मः सन्तस्त्वाचारलक्षणाःसाध्यासाध्यं कथं शक्यं सदाचारो ह्यलक्षणम्

sadācāro mato dharmaḥ santastvācāralakṣaṇāḥsādhyāsādhyaṃ kathaṃ śakyaṃ sadācāro hyalakṣaṇam

Our plain-language meaning of this verse is waiting for scholar review.