His father taught him that, as a king, your actions were never to be questioned.

Merlin taught him that, if you act like a prat, someone will call you on it, royal or not.

His father taught him to fight for himself.

Merlin taught him to fight for others.

His father taught him to be fearless, that he was invincible, and that being scared- of anything- was a weakness he could not afford to have.

Merlin taught him that it was all right to be afraid, as long as you didn't let it stop you from doing what you needed to do. And the idiot was certainly not invincible, and he needed to think at least twice before laying his life down needlessly.

His father taught him the value of money and his place in the kingdom.

Merlin taught him the value of friendship and his place in the world.

His father taught him that magic was an evil to be eradicated.

Merlin taught him that magic was a tool, just like his sword, neither good nor evil in itself, and legalizing it was the best way to keep Camelot safe from it.

His father taught him to be a king the people feared.

Merlin taught him to be a king the people could respect, and even love.

His father made him a king.

Merlin made him a great one.