If necessity is the mother of invention, discontent is the father of progress.

If necessity is the mother of invention, discontent is the father of progress.

Discontent is something that follows ambition like a shadow.

Discontent is something that follows ambition like a shadow.

Discontent is the seed of ethics

Discontent is the seed of ethics

Discontent is the first step in the progress of a man or a nation

Discontent is the first step in the progress of a man or a nation

Who is not satisfied with himself will grow; who is not sure of his own correctness will learn many things.

Who is not satisfied with himself will grow; who is not sure of his own correctness will learn many things.

Restlessness and discontent are the necessities of progress.

Restlessness and discontent are the necessities of progress.

One thing only has been lent to youth and age in common--discontent.

One thing only has been lent to youth and age in common--discontent.

Discontent is the first step in the progress of a man or a nation.

Discontent is the first step in the progress of a man or a nation.

I used to think I had ambition . . . but now I'm not so sure. It may have been read more

I used to think I had ambition . . . but now I'm not so sure. It may have been only discontent. They're easily confused.