The ottamans were attacking Europe for hundreds of years. I would consider them successful up until the siege of Vienna.

The Voltaire quote speaks to the fact that there is no coherent moral system man can create without a pure moral source.

That source of morality you recognize and, dane to indulge or deny is the makers mark in you.

The laws of morality are not like the laws of physics. A rock obeys the laws of physics. A person decides to obey the moral law.

https://youtu.be/xcCcHtqzQvs