Who said "Nothing occurs at random; all events have a cause."?

This quote is attributed to Leucippus.

Nothing occurs at random; all events have a cause. - Leucippus

"Nothing occurs at random; all events have a cause."

Leucippus Truth

Philosopher Ancient Greece 500–440

"Nothing exists except atoms and empty space; everything else is opinion."

"The void is as real as being."

"All things arise from necessity."

"Atoms are infinite in number and fall eternally through an infinite void."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."