Stephen continued to remind the religious leaders of the work of Moses in chapter seven, verses thirty four through thirty seven.  Remember, Stephen was still answering their to their charge of blasphemy, and he was reciting Jewish history.  As he closed out the story of Moses, the next fact that he related was that God saw the affiliation of His people.  God had come to deliver them, and He was sending Moses to Egypt to be His spokesman.  I wonder if he thought of the reason he had left Egypt.  We may at times not feel comfortable doing what God asks, but we must be willing to follow His leadership without question.  Moses asked who was he that the people would listen to him, and God said He would be with Moses.  God's proof to Moses was to be after the fact.  It would be proven once Moses led them out.  Not that it was started here, but when Moses asked Who was he to say sent him, God replied, "I am that I am."  I am sends you.  There is no explaining the existence of God in earthly terms, only the acceptance that He is the great I am.  Now, back to what Stephen was reminding the religious leaders of, just as proof that Moses was who he said he was occurred after the fact, so it was with Jesus.  Only after the death, burial and resurrection was there undeniable proof that Jesus was indeed Who He said He was. We either accept Him by faith or reject Him outright.  He can be nothing less than what He said He was.