Who said "Gratitude is the soil in which happiness grows."?

This quote is attributed to Alexandre Herculano.

Gratitude is the soil in which happiness grows. - Alexandre Herculano

"Gratitude is the soil in which happiness grows."

Alexandre Herculano Gratitude

Novelist Poet Portuguese 1810–1877

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"Freedom is the breath of the soul."

"Love is the only force capable of transforming an enemy into a friend."

"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"