Discontent is the first step in the progress of a man or a nation.
He who plants thorns must never expect to gather roses.
Restlessness is discontent – and discontent is the first necessity of progress. Show me a thoroughly satisfied man – and I will show you a failure.
Who is not satisfied with himself will grow, who is not sure of his own correctness will learn many things.
Discontent is the want of self-reliance: it is infirmity of will.
The idiot who praises, with enthusiastic tone, All centuries but this and every country but his own.
Discontent is something that follows ambition like a shadow.
Who with a little cannot be content, endures an everlasting punishment.
The greatest weariness comes from work not done.
The father of every good work is discontent, and its mother is diligence.