अप्युर्वीखननोत्कस्य कर्षतोऽपि शिलोच्चयम् ।स्वमनोनिग्रहादन्यो नोपायोऽस्तीह कश्चन
In plain words
Even for one eager to dig up the earth, even for one who would drag away a very mountain of stone, there is here no other means at all than mastery of one's own mind.