The last bunch of days at work have been very busy, but I don't feel that I accomplished much.
Did you ever have days/weeks like that?
I'm reminded of physics class in school. The teacher told us that if you push a rock all day, but it doesn't move, you've done no work. Our class argued that point, but the teacher always wins :)
We argued that if you pushed all day, you'd get pretty tired and you would have sweated a lot. The teacher didn't budge, just like the rock.
Well, I've felt like I've been pushing a rock today. I sure was busy all day, but I'm not sure the rock moved!
Sometimes you work hard at something and you feel like you didn't accomplish much at all. But, you don't find out until later that you actually accomplished something good.
I was trying to think about how this is like God's kingdom and remembered that Jesus told a story about some people who were later surprised to find out that they accomplished something good. Jesus told the story of the people who said "when did we help you?" and Jesus replied "when you did it for the least person, you did it for me." (note: that's the Henry Will paraphrase).
Here's the Bible reference: Matthew 25: 39-40.
So, be encouraged! You're efforts for good will eventually pay off!