Hare Krsna
Please accept my humble obeisance. All glories to Srila Prabhupada
By misusing his independence, the living entity falls down from the service of the Lord and takes a position in this material world as an enjoyer. That is to say, the living entity takes his position within a material body. Wanting to take a very exalted position, the living entity instead becomes entangled in a repetition of birth and death. He selects his position as a human being, a demigod, a cat, a dog, a tree, etc. In this way the living entity selects a body out of the 8,400,000 forms and tries to satisfy himself by a variety of material enjoyment. The Supersoul, however, does not like him to do this. Consequently, the Supersoul instructs him to surrender unto the Supreme Personality of Godhead. The Lord then takes charge of the living entity. But unless the living entity is uncontaminated by material desires, he cannot surrender to the Supreme Lord.
>>> Ref. VedaBase => SB 4.28.53
Time is eternal, and in the material world one passes through different phases of his eternal life. Time is compared herein to a sharp razor. A razor is meant to shave the hair from one's face, but if not carefully handled, the razor will cause disaster. One is advised not to create a disaster by misusing his lifetime. One should be extremely careful to utilize the span of his life for spiritual realization, or Krsna consciousness.
>>> Ref. VedaBase => SB 6.5.19
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