Be the captain never so wise, if none of the crew obey him how shall the ship reach its port or the sailors learn the art of navigation?
Christ clearly pointed out that obedience is the path of knowledge.

He said:--"My doctrine is not mine, but his that sent me.

If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself."-- St.John vii, 16-17.
So Baha'u'llah says: "Faith in God, and the knowledge of Him, cannot be fully attained except ...

by practicing all that He hath commanded and all that is revealed in the Book from the Pen of Glory."-- Tablet of Tajalliyat.
Implicit obedience is not a popular virtue in these democratic days, and indeed entire submission to the will of any mere man would be disastrous.
But the Unity of Humanity can be attained only by complete harmony of each and all with the Divine will.

Unless that Will be clearly revealed, and men abandon all other leaders and obey the Divine Messenger, then conflict and strife will go on, and men will continue to oppose each other, to devote a large part of their energy to frustrating the efforts of their brother men, instead of working harmoniously together for the Glory of God and the common good.
Service Devotion to God implies a life of service to our fellow- creatures.