What is the most important word in the bible?

What is the most important word in the bible?  That was the challenge to us yesterday.  After some discussion and looking at a passage on practical matters, it was suggested that the most important word is OBEDIENCE.  One of the practical matters that was listed in the passage was Teaching.  I do not know if it means teaching the afore mentioned skills, or as I would normally use the word, Teaching the word of God, but I do feel that I have entered a time when this matter needs to be looked at.