One interpretation of the “greater things” Jesus said the disciples would do, is “little things pushing bigger things”. What a powerful image of living like a hero. That’s why we admire heroes. We never thought those people could actually take on a bigger more intimidating foe. But they did. And that’s why we hold them up as heroes.
We often don’t believe we can live heroically because we just can’t imagine taking on battles larger than us. But “doing greater things” is a promise of Jesus, that came with the power of Jesus.
So why do we doubt? Why are we afraid? Why don’t we step out?
Inside of each one of us is the makings of a hero. But we have to be willing to cast off and let go of all of the things our world tells us is important, and realize that we were created, designed, to do “greater things”... to be small things that can do bigger things.