The Lord continues: The man who knew how to avoid these three gates of hell dedicates his existence to acts which engage in the realization spiritual. He thus gradually achieves the supreme goal.
We must beware of these three enemies of human life, lust, anger and greed. The more a human being frees himself from it, the more his existence is purified. He can then observe the rules and principles of the holy Vedic scriptures, the Vedas, the original holy scriptures. By thus following the regulatory principles of human life [not to have sex outside marriage, not to eat meat, fish or eggs, not to consume drugs or exciting products such as alcohol, cigarettes, coffee, tea, not gambling], it gradually rises to the level of spiritual realization. And if by observing these principles he still finds himself happy enough to attain Krishna consciousness, God consciousness, then for him success is assured.
This path of purification is attained by all who are free from concupiscence, anger and greed. By the knowledge thus acquired, they will be able to rise to the highest level of spiritual realization, which finds its perfection in the loving and devotional service offered to Krishna. In this devotional service, the liberation of the conditioned soul from the world of matter is certain.
The Lord said: He on the other hand, who rejects the precepts of the holy scriptures to act according to his whim, he does not attains neither perfection, nor happiness, nor the supreme goal [which is none other than God Himself].
Once the soul has reached the human form, that is to say incarnated in the human form, she is expected to become sane and able to follow the principles given to her to rise to the highest position. But let her neglect their observance and she will find herself degraded.
However, if, even by following these moral rules and principles, she does not ultimately come to know the Supreme Lord, all the knowledge she will have able to acquire will be struck with vanity.
She must therefore gradually rise to the level of Krishna consciousness, of the loving and devotional service that she offers Him, and only there can she attain the highest perfection.
Truly, the purpose of the human form is to purify existence, and those who refuse to observe its rules and principles can neither purify themselves nor find true happiness.