CC Ādi 1.63
তীর্থীকুর্বন্তি তীর্থানি স্বান্তঃস্থেন গদাভৃতা ॥ ৬৩ ॥
tīrtha-bhūtāḥ svayaṁ vibho
bhavat — your good self; vidhāḥ — like; bhāgavatāḥ — devotees; tīrtha — holy places of pilgrimage; bhūtāḥ — existing; svayam — themselves; vibho — O almighty one; tīrthī-kurvanti — make into holy places of pilgrimage; tīrthāni — the holy places; sva-antaḥ-sthena — being situated in their hearts; gadā-bhṛtā — by the Personality of Godhead.
“Saints of your caliber are themselves places of pilgrimage. Because of their purity, they are constant companions of the Lord, and therefore they can purify even the places of pilgrimage.”
This verse was spoken by Mahārāja Yudhiṣṭhira to Vidura in Śrīmad-Bhāgavatam (1.13.10). Mahārāja Yudhiṣṭhira was receiving his saintly uncle Vidura, who had been visiting sacred places of pilgrimage. Mahārāja Yudhiṣṭhira told Vidura that pure devotees like him are personified holy places because the Supreme Personality of Godhead is always with them in their hearts. By their association, sinful persons are freed from sinful reactions, and therefore wherever a pure devotee goes is a sacred place of pilgrimage. The importance of holy places is due to the presence there of such pure devotees.