We know greatness when we see it but find it difficult to define for ourselves. Some people are born with a talent for greatness, others manage to develop it.
Many presidents of nations and large corporations try to establish a legacy that will make them be remembered as "a great leader". Most of them fail miserably in that particular goal because they have not understood what greatness is and if you do not know what it is, you won't know how to attain to it either.
