Have you noticed the extreme nebulicity of God's activity?
We enjoy our multiple labors in His vineyard and we may see great fruit for the moment and we may not for it will come well down the road.
I so love working in such an unframed and unbound zone of nebulicity for God has different measuring devices than we.
When the widow with her mite was praised by Jesus, what do you see of her faith in the following days. Nothing. What good did she do in giving it?
Of the woman who had five husbands, Jesus told her to go and sin no more. What do you have as proof she did? Nothing.
Our walk is a constant score of randomly bumping into people as well as intentional connections throughout the day. Each interaction is pregnant with the Jesus persuasion. Yet, at the end of the day, prove it.
Just as Jesus returned from the grave at the end of three, there were two full days of heavy doubting. And....then there is God. Such is all of the proof we can conceive for much of our effort. Sometimes we see the third-day results and sometimes we don't see it for months or years or decades or never in our lifetime.
Do you think Paul thought about anyone gleaning from his letters in 2011? Doubtful. What we do today for and with God will bear fruit in 2012 and in 3817 if earth lasts that long.
Regarding our kingdom efforts, "prove it" is the wrong phrase. The correct one would be "believe it".