“If you want to get something done … then give it to a busy person.” This adage speaks a general truth about human nature, but it can especially apply to Christians.
First, a general observation
Someone who’s busy is used to getting things done, and one more task flows into the stream of a can do mentality. Someone who isn’t already busy doesn’t have a sense of urgency or the mindset to move forward.
Then why this is applies to Christians in particular
Christians are givers. We understand that we have received what we don’t deserve. “While we were still sinners, Christ died for us.” (Rom 5:8) So we’re willing to give to others in the same way.
This is different from the general population which often thinks that it’s unfair to give more than they have received. They’re often protecting themselves and trying not to give too much, because that would be unfair.
In contrast, Christians have a different mentality–we want to serve others because Christ serves us. The cross was unfair and we are willing to pour ourselves out for others who are just as undeserving as we were. This creates a witness for Christ, and this tends to make us busy.
But Christian busy is not worldly busy
Being a busy Christian is someone who can also rest. Christians sabbath, they take time for contemplation, and they pull back to pray. But what is the result of this? The result is that we can keep giving. We take time to receive from Christ and the result is that we can give more in Christ.