Who said "Silence is sometimes an art."?

This quote is attributed to Xenophon.

Silence is sometimes an art. - Xenophon

"Silence is sometimes an art."

Xenophon Solitude

Historian Soldier Ancient Greece 430–354

"The sweetest of all sounds is praise."

"He who wishes to be obeyed must know how to command."

"It is impossible for a man to be cheated by anyone but himself."

"Know thyself."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."