Let me explain this with a few examples. Just like time, budgets are also limited (depending on where you serve, they might be severely limited). If I have $100 to do ministry, and I choose to use that $100 on 10 different events, than each event will get $10...make sense? Ok, what if I were to decide to only do 2 events instead. Now, each of those events will get $50 instead of $10. Suddenly, I have free up the resources I need to do these events 5 times better than I would have before. It is the same way with my time/energy. I can only give 100%. If I choose to have 10 things going, than they will each get about 10% of my energy.
What I am trying to say is if I can focus on 4-5 things and make them excellent rather than having 10-12 things that are average, than Less really is more!
The hard part comes with trying to decide what the 7-8 things that I am suppose to stop doing are :)