Difficulties mastered are opportunities won.

Adversity is the mother of progress.

What I know for sure is that there is no strength without challenge, adversity, resistance, and often pain.

Difficulties come when you don't pay attention to life's whisper. Life always whispers to you first, but if you ignore the whisper, sooner or later you'll get a scream.

Adversity makes you stronger, don't give in, don't back down, and never stop doing what you know is right. Nothing worth doing, ever ever ever came easy, and the more righteous you fight, the more opposition that you will face. I've accomplished a tremendous amount, in a very short time as president.

The value of liberty was thus enhanced in our estimation by the difficulty of its attainment, and the worth of characters appreciated by the trial of adversity.