WHAT is enthusiasm? Enthusiasm means to be connected to God within. When you are with your source, you can only be enthusiastic and you cannot be but enthusiastic when your mind is totally in the present moment. Apathy is when you are away from the source of life.
You should know that dispassion is not apathy; it is simply a broader perspective of reality. Dispassion is moving toward the source. Dispassion simply means the way back home. It is the journey toward the source, which is a reservoir of enthusiasm.
When dispassion and enthusiasm co-exist, that is the secret of perennial enthusiasm and profound dispassion. Though they appear to be opposite, they are actually complementary.
Sri Sri Ravi Shankar