Who said "The development of true friendship is a slow process."?

This quote is attributed to Voltaire.

The development of true friendship is a slow process. - Voltaire

"The development of true friendship is a slow process."

Voltaire Friendship

Writer Philosopher French 1694–1778

"It is dangerous to be right when the government is wrong."

"Life is thickly sown with thorns, and I know no other remedy than to pass quickly through them."

"The perfect is the enemy of the good."

"Judge a man by his questions rather than by his answers."

"Friendship is built on trust and honesty."

"True friendship is worth more than gold."

"Good friends are like stars, always there even when you can't see them."

"Friendship means sacrifice."