His book, And to Think That I Saw it on Mulberry Street , was rejected 28 times before being published. In fact one well known comment was "“This is too different from other juveniles on the market to warrant its selling.” Wow! But he persisted. With persistence comes payoff. He later went on to write more classics such as The Cat in the Cat , Green Eggs and Ham, and How the Grinch Stole Christmas.
So when that next rejection comes along, thing Seuss!