Eagerly, we gather together to study God's Word to learn what we ought to do. That is a good model. I suppose it is possible to be eager to get something over with and thus to do whatever the job is without any enthusiasm. The young man showed enthusiasm in just the way he made his entrance. He RAN UP to Jesus, ready for just about anything the Master had to say.
Enthusiasm is GOOD for a learner.
If you want to test that out, think back to the most boring class you had in school. We have all had at least one. Now think how much you learned from that class. It probably parallels the amount of enthusiasm you brought to each session. You learned little or nothing.