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 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)
A fully responsible man should always be conscious of the prime duty of the present human form of life. The activities to meet the immediate necessities of material life are not everything. One should always be alert in his duty for attainment of the best situation in the next life. Human life is meant for preparing ourselves for that prime duty.
To purify the heart is the one and only purpose that God has created this human life.