What is a saying in latin? or any language, and its explanation in english to describe the life fact of wisdom?

wisdom that in life we can make fools of ourselves by not having a particcular life experience which leads us to a cource of action,consequence or misguided attempt to manage the situation,or respond,which we later discover our weakness and error of ways,ideed playing the fool!!!??? http://www.bbc-antiques.co.uk