There are always two sides to any coin. So whether or not you should go ahead with one decision always has a 50% chance of turning out correct. This forms a crucial element in doubt and uncertainty. You are always unsure of what is right and wrong, but taking the risk is the only way. It was once said- You cannot be certain about uncertainty. To define it any other way, would be quite difficult. So make use of some of these famous doubt quotes and sayings to be surer!