Predestination is the belief that all things are mapped out for us before we are born and we have no free will it is just a matter of fate that has been pre determined for us.
Ancient Greeks beleived that it was the gods that determined evrything that we do in life.
If this is the case then no matter what we do it will always be the right choice in the end even though sometimes we might not think so at the time when things go wrong in our lives.
Predestination therefore means that we can only follow our destiny.
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Its a mad mad world out there and were in it.