There is no greater mistake than to try to leap an abyss in two jumps.

David Lloyd George (1863-1945) Welsh politician, statesman, UK Prime Minister (1916-22)

War Memoirs of David Lloyd George, Vol. 2, ch. 24 (1933)

Not original with Lloyd George, but usually attributed to him. For more information, see here. Variants:

• "Don’t be afraid to take a big step. You can’t cross a chasm in two small jumps."
• "The most dangerous thing in the world is to leap a chasm in two jumps."
• "Anything can be achieved in small, deliberate steps. But there are times you need the courage to take a great leap; you can't cross a chasm in two small jumps."
• "There is nothing more dangerous than to leap a chasm in two jumps."