ye 'nye 'ravindākṣa vimukta-māninas tvayy asta-bhāvād aviśuddha-buddhayaḥ āruhya kṛcchreṇa paraṁ padaṁ tataḥ patanty adho 'nādṛta-yuṣmad-aṅghrayaḥ

"O Lord, the intelligence of those who think themselves liberated but who have no devotion is impure. Even though they rise to the highest point of liberation by dint of severe penances and austerities, they are sure to fall down again into material existence, for they do not take shelter at Your lotus feet." (Srimad-Bhagavatam 10.2.32) Yusmad-aṅghrayah refers to the lotus feet of Krsna. If one does not take shelter of Krsna's lotus feet, he falls down (patanty adhah), even from liberation. The Hare Krsna maha-mantra, however, gives liberation and at the same time offers shelter at the lotus feet of Krsna. If one takes shelter at the lotus feet of Krsna after liberation, he develops his dormant ecstatic love for Krsna. That is the highest perfection of life.