"Great works are performed, not by strength, but by perseverance" — Samuel Johnson

All things excellent are as difficult as they are rare.

Source: Ethics, part 5, conclusion (1677)

Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air.

Source: Orations, Plymouth address (1802)

I am always easy of belief when the creed pleases me

It is the greatest art of the devil to convince us he does not exist.

Concentration is my motto - first honesty, then industry, then concentration

Our anxiety does not empty tomorrow of its sorrow, but only empties today of its strength

Samuel Johnson Quote