Scientific greatness is less a matter of intelligence than character; if the scientist refuses to compromise or accept incomplete answers and persists in grappling the most basic and difficult questions.
Plan for what is difficult while it is easy, do what is great while it is small. The difficult things in this world must be done while they are easy, the greatest things in the world must be done while they are still small. For this reason sages never do what is great, and this is why they achieve greatness.
Anecdote: Greatness Means Leading the Way. No stream is large and copious of itself, but becomes great by receiving and leading on so many tributary streams. It is so, also, with all intellectual greatness, It is only a question of someone indicating the direction to be followed by so many affluent; not whether he was richly or poorly gifted originally.
As the observance of divine institutions is the cause of the greatness of republics, so the disregard of them produces their ruin; for where the fear of God is wanting, there the country will come to ruin, unless it be sustained the fear of the prince, which temporarily supply the want of religion.
When it is impossible to stretch the very elastic threads of historical ratiocination any farther, when actions are clearly contrary to all that humanity calls right or even just, the historians produce a saving conception of 'greatness.' 'Greatness,' it seems, excludes the standards of right and wrong. For the 'great' man nothing is wrong, there is no atrocity for which a 'great' man can be blamed.
There is sense in hoping for recognition in a distant future only when we take it for granted that mankind will remain essentially unchanged, and that whatever is great is not for one age only but will be looked upon as great for all time.
I can't tell you what it's like to be in Europe, for example, to be talking about the greatness of America. But the true greatness of America are the people.
But not to perish from internal distress and doubt when one inflicts great suffering and hears the cry of suffering : that is great, that belongs to greatness.