Who said "Gratitude is the mother of all virtues."?

This quote is attributed to Law, John.

Gratitude is the mother of all virtues. - Law, John

"Gratitude is the mother of all virtues."

Law, John Gratitude

Sociologist-Philosopher British Born 1954 (age 72)

"Money is the sinews of action"

"Knowledge is power"

"The love of money is the root of all evil"

"In the midst of winter, I found there was, within me, an invincible summer"

"Gratitude makes life richer."

"A grateful heart is a happy heart."

"Respect those who came before us."

"Life's greatest treasures are the people we love"