Exodus 10:21 says, And the LORD said unto Moses, Stretch out thine hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be felt.  God told Moses to stretch out his hand toward heaven, and that there would be a darkness that could be felt.  The Creator of light was going to remove the light for a time.  God really didn't need Moses in order to accomplish this, but He chose to work through Moses, and God doesn't really need us today to accomplish His will but He choses to work through us.  Verse twenty-two states, And Moses stretched forth his hand toward heaven; and there was a thick darkness in all the land of Egypt three days:  Once more Moses did what God told him to do, and God delivered on His promise.  It was dark for three days, just as there was a spiritual darkness for three days when Jesus was in the tomb.  Verse twenty-three adds, They saw not one another, neither rose any from his place for three days: but all the children of  Israel had lights in their dwellings.  The darkness was just on the Egyptians and not the Israelites.  Today, those who are not followers of Christ live in spiritual darkness.  Verse twenty-four declares, And Pharaoh called unto Moses, and said, Go ye, serve the LORD; only let your flocks and your herds be stayed: let your little ones also go with you.  Pharaoh tried to compromise once more, saying all the people could go but not the herds.  People too often attempt to compromise with God, wanting to accept part of what God's word says, but not all.  Verse twenty-five proclaims, And Moses said, Thou must give us also sacrifices and burnt offerings, that we may sacrifice unto the LORD our God.  Moses told Pharaoh that he must give the Israelites something to sacrifice to God.  All we can really sacrifice to God is our life.  Everything else is already His, but we can only become His by willingly sacrificing ourselves to Him.  Verse twenty-six adds, Our cattle also shall go with us; there shall not an hoof be left behind; for thereof must we take to serve the LORD our God; and we know not with what we must serve the LORD, until we come thither.  Moses then said that all their cattle had to go as well.  We must bring everything to God if we are to truly worship Him.  Verse twenty-seven declares, But the LORD hardened Pharaoh’s heart, and he would not let them go.  Once more, Pharaoh's heart was hardened and he changed his mind.  Verse twenty-eight continues, And Pharaoh said unto him, Get thee from me, take heed to thyself, see my face no more; for in that day thou seest my face thou shalt die.  Pharaoh told Moses to leave and if he came again Pharaoh would kill him.  We may never face such a test of our faith, but if we do we must be ready to stand firm.  Verse twenty-nine concludes, And Moses said, Thou hast spoken well, I will see thy face again no more.  Moses told Pharaoh that he would see him no more.  If we give up on a person accepting Christ, we must make sure that God has told us to do so.