Exerpts from Victory Over Death - The Human Body

"...The human body is fully equipped to achieve this end." Therefore, one must conquer the pushing agents of the material senses like the urge to speak, the mind's demands, actions of anger, tongue, belly and genitals, and focus all one's energies in service of the Supreme Personality of Godhead to fulfil the actual purpose of human life.
Pg. 8

...Thus the brief span of human existence is like crossroads, where a traveller can choose one of many paths. And when one falls down into lower species, one has to finish the term in those animal species, exactly like a prisoner who is subjected to imprisonment for a fixed period of time, after which one again gets an opportunity of a human body.

The human body is awarded to give an opportunity to the suffering soul, to realise the Lord and return to His abode. If one neglects this goal, one may repeatedly be cast in innumerable lower bodies to suffer repeated birth and death. Thus, a sane human being should wake up to the truth and plan for himself, how to approach death successfully so that one will not have to return again to this world of repeated birth and death.
Pg. 23