Because human life is a combination of matter and spirit soul, the whole process of Vedic knowledge is directed at liberating the spirit soul from the contamination of matter.
Srimad Bhagavatam 2.1.3,
Srila Prabhupada
Human life is meant for subduing the modes of passion and ignorance and advancing in the mode of goodness.
Srimad Bhagavatam 10.10.8,
Srila Prabhupada
The human life is meant for attaining eternal and unlimited happiness by spiritual realization.
Srimad Bhagavatam 1.3.13
Human life is specifically meant for self-realization. It is the junction from where we can depart from the path of illusion and enter onto the free way of truth.
Human life is meant for becoming freed from animalistic propensities of spending your whole life simply interested in eating, sleeping, sex and fighting.
Lecture on Real Success Stories Are in Srimad-Bhagavatam (SB 8.4.15; Ljubljana, Slovenia, 26 Dec 1998)