From His pen of glory flowed teachings for the prevention of war, and these have been scattered far and wide.
His first teaching is the search after truth.

Blind imitation, He declared, killeth the spirit of man, whereas the investigation of truth frees the world from the darkness of prejudice.
His second teaching is the oneness of mankind.

All men are but one fold, and God the loving Shepherd.

He bestoweth upon them His most great mercy, and considers them all as one.

"Thou shalt find no difference amongst the creatures of God." They are all His servants, and all seek His bounty.
His third teaching is that religion is the most mighty stronghold.
It should be conducive to unity, rather than be the cause of enmity and hate.