Paulo Coelho. The devil and miss Prym (№ 47512)

Man can not realize their dreams in two cases: when they are completely unrealistic and when once the wheel of fortune makes a sudden turn, they turn into something quite feasible, Yes, but you're not ready.
Then that covers you for fear of the road leading to God knows where, prior to life throwing you not know the challenges that all familiar and settled will disappear completely and forever.