Truth alone triumphs, not falsehood. By truth is laid out the path of the gods, by which the sages whose desires are fulfilled ascend to that supreme abode of truth. ("Satyameva Jayate" — the motto of India.)
Mundaka Upanishad
मुण्डकोपनिषद्
मूल श्लोकः
सत्यमेव जयते नानृतं सत्येन पन्था विततो देवयानः। येनाक्रमन्त्यृषयो ह्याप्तकामा यत्र तत्सत्यस्य परमं निधानम्॥
satyam eva jayate nānṛtaṁ satyena panthā vitato deva-yānaḥ yenākramanty ṛṣayo hy āpta-kāmā yatra tat satyasya paramaṁ nidhānam
MuU 3.6