Who said "The perfection of moral virtue is not easily achieved."?

This quote is attributed to Thomas Aquinas.

The perfection of moral virtue is not easily achieved. - Thomas Aquinas

"The perfection of moral virtue is not easily achieved."

Thomas Aquinas Perseverance

Theologian-Philosopher Italian 1225–1274

"The things that we love tell us what we are."

"To one who has faith, no explanation is necessary. To one without faith, no explanation is possible."

"There is nothing on this earth more to be prized than true friendship."

"Silence is the best response to a fool."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."