One of my kids asked why the verse doesn't say God in it and then we talked about other names for God - I want my kids to learn to call on God and praise Him with His various names - names of endearment that are encouragement to us.
They also asked why it says the Lord two times - my thought was that it was to remind us that it is the Lord without any doubts or hesitations and to not give any credit to anyone else. I also think God knew we need to hear things more than once to make it stick.
We claimed this verse for our marriage and placed it on our wedding cake and now it is a part of our home to continue to strive towards trust in our relationship with God.
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Isaiah 26:3-4 (New International Version)
3 You will keep in perfect peace
him whose mind is steadfast,
because he trusts in you.
4 Trust in the LORD forever,
for the LORD, the LORD, is the Rock eternal.