Mahabharata 12.239.18

यदूर्ध्वं पादतलयोरवाङ्मूर्ध्नश्च पश्यतिएतस्मिन्नेव कृत्ये वै वर्तते बुद्धिरुत्तमा

yadūrdhvaṃ pādatalayoravāṅmūrdhnaśca paśyatietasminneva kṛtye vai vartate buddhiruttamā

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