Who said "When you meet resistance, you know you're on to something."?

This quote is attributed to Tacitus.

When you meet resistance, you know you're on to something. - Tacitus

"When you meet resistance, you know you're on to something."

Tacitus Perseverance

Historian Ancient Rome 56–120

"The desire for safety stands against every great and noble enterprise."

"It is a rare thing for justice and power to dwell together."

"Success is not final, failure is not fatal."

"Fear is the tax that conscience pays to guilt."

"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."