The Lord had told Moses what was to happen. The question is whether Moses told the people. We are not told. God did not say 'tell my people'. It would be interesting (though maybe speculative) to ask how the people would have reacted if Moses had told them; probably much the same reaction. The point either way would have been that the Lord has to be trusted. Knowing or not knowing the details often in advance has little to do with our acceptance and willingness to undergo what must happen. This is a space that only trust, even trust in great big unimaginable miracles can fill.
I am sure that the Lord is always encouraging of prayer and communication. Crying out may not always be appropriate however. David for instance often cries out in his Psalms but, his desperation often leads him to the conclusion that God is truly great and a mighty deliverer in times of need. How often do we cry out however with desperation alone, seeking for answers that we are not prepared to follow, directions we are not observant to go, pleading for self strength without having established ourselves within His. We can not be too hard on these Israelites for they are experiencing God many of them for the first time. We should be harder on ourselves for having had their experience plus our own plus that of others and still yet crying out for the sake of crying out. Is there not reason to be communicating with God on a totally different level?
Honor at another man's expense is typically not a good thing. Honor if by the hardness of ones own heart after being given every opportunity to do otherwise and after having given one's oath not to pursue this any further... that is honor above and beyond, especially when it is the course of two nations and not just single men. The men that will die along with him have made their choices long ago to blindly and courageously serve regardless of Pharaoh's right and wrong. They by their personal honor/allegiance will die by their Pharaoh's utter dishonor. Make your choices wisely my friends!
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