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
Human Life is meant for reviving one’s eternal relation with the Lord and all religious injunctions are meant for awakening this dormant instinct of the living entity.
One second of human life wasted in the vain research of planning for happiness in the material world can never be replaced even if one spends millions of coins of gold.
The human form of life is rare and valuable.
Srimad Bhagavatam 2.3.2-7,
Srila Prabhupada