Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 35-36

Sanskrit:

श्रीउद्धव उवाचत्वत्त: परावृत्तधिय: स्वकृतै: कर्मभि: प्रभो ।उच्चावचान् यथा देहान् गृह्णन्ति विसृजन्ति च ॥ ३५ ॥तन्ममाख्याहि गोविन्द दुर्विभाव्यमनात्मभि: ।न ह्येतत् प्रायशो लोके विद्वांस: सन्ति वञ्चिता: ॥ ३६ ॥

ITRANS:

śrī-uddhava uvācatvattaḥ parāvṛtta-dhiyaḥsva-kṛtaiḥ karmabhiḥ prabhouccāvacān yathā dehāngṛhṇanti visṛjanti ca

Translation:

Śrī Uddhava said: O supreme master, the intelligence of those dedicated to fruitive activities is certainly deviated from You. Please explain to me how such persons accept superior and inferior bodies by their materialistic activities and then give up such bodies. O Govinda, this topic is very difficult for foolish persons to understand. Being cheated by illusion in this world, they generally do not become aware of these facts.

Purport:

No one can be considered intelligent without understanding the science of God, which includes a description of the negative results of those who have forgotten their eternal relationship with Him. There are many so-called wise men in the world, but although considering themselves to be most intelligent, they generally do not surrender to the supreme intelligence of the Lord. Thus they concoct varieties of philosophies according to their positions within the modes of nature. However, one cannot escape the influence of material nature through philosophy generated from that same illusory nature. Liberation is achieved by perfect knowledge coming from the spiritual platform, the kingdom of God. By faithfully hearing from Lord Kṛṣṇa and His authorized representatives one can easily achieve liberation and go back home, back to Godhead.