For we hear that some among you walk in idleness, not busy at work, but busybodies. Now such persons we command and encourage in the Lord Jesus Christ to do their work quietly and to earn their own living. -- 2nd Thessalonians 3:14
It's easy in times of idleness to fall into such traps; by nature we are self concerned and judgmental. Fortunately God gave us something to help us avoid this: work. Work doesn't necessarily have to be your day job; it can be anything done for a purpose that brings glory to God. If you have 3 months off in the summer because you're a teacher, then volunteering at a day camp could be work. Writing a blog post could be work (at least I tell myself it is.) Processing your way through a commentary on the book of Isaiah could be work.
The point is that idleness isn't of God. We all need rest; God commanded Elijah to go to sleep when the world became too much for him. That said, if you've come to the point that you're well rested enough to realize that the lack of work is affecting you negatively, then you need to get to work. God wants you to work, and through the experience rely on him so he can draw you closer to him. When we're idle, we're not relying on God at all, and we're not doing anything to change it. Remember that in everything we do, God should be glorified, and because of our selfish nature, they don't always come naturally. Strive for God, and you will find yourself doing great things solely on him carrying your works.