Exodus 17

2 Previously, the people had found bitter water, but this time they did not even have that. But still being shortsighted they demand that Moses give them water. Moses knew that only God could provide for the people.
3 Again, the people charge Moses with rescuing them from Egypt for the soul purpose of killing them. Such hysterical charges don't help anything.
4 Even spiritual leaders can feel threatened and frustrated. Moses was following God's directions without question. He did not know what God's day to day plan was, so he had to go completely on faith. Moses appears to have been at the end of his rope. The good thing is that Moses went to God. We can all be real and open to God.
5 The rod had become the symbol of God's power. Moses was to reveal God's power directly to the leadership within Israel.
6 This is a miracle because it was predicted, executed, and glorified God.
7 Doubts can outpace faith if we let it. We need to wait on God with expectation. There are some situations we have to rely completely on God. The Israelites could not get water out of rock, but God could. In our walks, we might find ourselves pushed to the very limit of life. We must not give up.
12 We know that Moses did not have any power in his arms per-say. God was once again showing how He could work through people of faith. So why did God allow Moses' arms to get tired? Perhaps the symbolic lesson is that God intends us to work together. God's works are larger than life, and God graciously allows us to participate in those works. In many (or most) cases these works are too large for one person anyway. Only through teamwork can we have the strength and support to handle the work God gave us to do.
13 The Amalekites were the feared giants.
14 We have already seen several types of memorials: ritual circumcision, songs, and monuments. Now God commands the memorial be put in writing. Many symbols can be abstract and require that someone be able to educate others as to their meaning. The written word should be easier to understand and be less likely to be misunderstood. While it is the best medium to preserve events, it is still subject to interpretation. As the eyewitnesses die out the relatively short summaries given in written records can't possibly include all the details that make it seem "as if you were there." This is further compounded as languages change over time and manuscripts are copied and translated between languages.