If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.
— Mark Twain

Adversity has the effect of eliciting talents, which in prosperous circumstances would have lain dormant.
Horace prosperous quote

Countries with a higher proportion of trustworthy people are more prosperous.
— Paul Zak

Apply yourself both now and in the next life. Without effort, you cannot be prosperous. Though the land be good, You cannot have an abundant crop without cultivation.
— Plato

Hope on, and save yourself for prosperous times.
— prosperous quotation by Virgil