There are different kinds of liberation. The first liberation, as the jñānīs or the speculators want, it is another side of voidism, to merge into the existence of the Absolute. They don't want varieties. Because they have got a very bad experience of the varieties in the material world, they, as soon as there is question of varieties, they become shuddered, "Oh, again varieties?" They do not know that there is blissful varieties in association with Kṛṣṇa. They can not accommodate in their brain on account of poor fund of knowledge. Therefore they want sāyujya-mukti, to merge into the existence of the..., to become one with the Supreme. That is possible. You can have it. But it you lose your individuality then you can get eternity, but you cannot get blissful life of knowledge, because you lose your individuality. So that is suicidal. But a living entity being individual soul, he cannot remain in that impersonal state of life. Because the other two factors, namely acquire knowledge and acquire blissful life, is wanting there. It is simply negation of these material varieties. Or eternity only—sat. But there are two other parts, cit and ānanda. That is absent there.
So because it is not fully realized, therefore such living entities who take sāyujya-mukti, they again fall down in due course of time. Because he doesn't get in the sāyujya-mukti the other two parts, component parts of his life, blissfulness and knowledge, full knowledge. Āruhya kṛcchreṇa paraṁ padaṁ tataḥ patanty adhaḥ anādṛta-yuṣmad-aṅghrayaḥ (SB 10.2.32).