What you think is a decision of your own volition, in reality is 70% of what you have inherited and 30% of what the environment dictates. The same genetic code that determines your physical appearance before birth also determines prenatally your outlook on life, your behaviour and your experiences! Therefore the life that you live today has already been genetically predicted for you.
A man can be compared to a missile which is launched into a particular orbit that can only be changed when you understand the applicable dynamics.