"Bring him to me," said a certain Dr.Tronchin, of Geneva, speaking of Rousseau--"Bring him to me, that I may see whether he has got anything in him!"-- the probability being that Rousseau, who knew himself better, was much more likely to take measure of Tronchin than Tronchin was to take measure of him.
A due amount of self-knowledge is, therefore, necessary for those who would BE anything or DO anything in the world.

It is also one of the first essentials to the formation of distinct personal convictions.
Frederic Perthes once said to a young friend: "You know only too well what you CAN do; but till you have learned what you CANNOT do, you will neither accomplish anything of moment, nor know inward peace." Any one who would profit by experience will never be above asking for help.

He who thinks himself already too wise to learn of others, will never succeed in doing anything either good or great.

We have to keep our minds and hearts open, and never be ashamed to learn, with the assistance of those who are wiser and more experienced than ourselves.
The man made wise by experience endeavours to judge correctly of the thugs which come under his observation, and form the subject of his daily life.

What we call common sense is, for the most part, but the result of common experience wisely improved.