Writing this in a fog of headache/tiredness/bug and all that goes with it (hence the delay). Sorry if it’s incoherent
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Peter’s impassioned preaching here is designed to show the Israelites amongst his audience that, whatever they think, however much control they think they have had over their lives, God has seen the present circumstances from the beginning, just as He sees the end. The crucifixion of Jesus was not an end, it was not even a disaster, it was part of the plan of God to bring about His purposes. Whatever else might have been at play, God’s purposes would not be stifled, and David had foreseen how things would be.
So often we mistake the gift of free will and choice that God gives us for control of our own destiny. We can make choices each day (those of us who are free enough to by the grace of God) but we cannot affect our destiny. “The Earth is the Lord’s, and everything in it”. He is working His purpose out. His purpose is life, love, hope, freedom. His purpose is relationship with us. It always has been. He will not be denied.
Don’t fall into the trap of thinking that you are in control. Rejoice in the fact that you are not.