There is usually a difference between those two adjectives.
Do you want to be a great entrepreneur or ‘the greatest entrepreneur who ever walked the face of this planet?’ .

Do you want to be Tippu Sultan or Alexander the Great?

When you become great, you reach a point of diminishing returns, where the effort required to get to the next level is legendary but the returns only marginally so ( until they start compounding to make you the greatest ever )

The intangible delta between ‘great’ and ‘the greatest ever’ is OBSESSION.

If you don’t believe that for a fact, if you can’t look yourself in the mirror , in the eyes and say to yourself that – ‘ I am going to be greatest entrepreneur who ever walked the face of the earth’, then how good can you really be?

You should not be saying that because you think you are better than anybody else but you should be saying that because you are willing to put in the effort and sacrifice things that no other person is willing to sacrifice to get to where you want to.