This war in heaven was not a war of bloodshed. It was a war of conflicting ideas – the beginning of contention.
Scriptures repeatedly warn that the father of contention opposes the plan of our Heavenly Father. Satan’s method relies on the infectious canker of contention. Satan’s motive: to gain personal acclaim even over God Himself.
The work of the adversary may be likened to loading guns in opposition to the work of God. Salvos containing germs of contention are aimed and fired at strategic targets essential to that holy work. These vital targets include – in addition to the individual – the family, leaders of the Church, and divine doctrine. — Elder Russell M. Nelson, Ensign, May 1989, p. 69