Premanand Maharaj Ji
What happens if I avoid seva, and why does a mind without seva become low and fearful?
Unused energy for action turns on the mind
Seva removes sins and gives our inner energy for action a meaningful use. When we take from the world but avoid serving Bhagwan, that energy turns on the mind.
Through seva, sins are destroyed, and our energy for action becomes meaningful, because it is seva of Bhagwan.