Ezra 5:5 But the eye of their God was upon the elders of the Jews, that they could not cause them to cease, till the matter came to Darius: and then they returned answer by letter concerning this matter.
It was the eye of their God on them that caused them to do the work and not to stop. It was that they were working for God and not for men. It was that they found God to be worthy of their effort.
I wonder how often that I remember that I am serving God. I wonder how often I live in full expectation that He is at work in me and that I am working for Him. I will preach this morning but it needs to be because it is for Him and He is looking. I will give an offering today but it needs to be for Him and because He is looking. We are serving God and must never forget that.