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Where does the Bible say God has good plans for us?

It is in Jeremiah 29:11 · King James Version

«For I know the thoughts that I think toward you, saith the Lord, thoughts of peace, and not of evil, to give you an expected end.»
Read the chapter Jeremiah 29 →

See also

Proverbs 16:9

A man’s heart deviseth his way: but the Lord directeth his steps.

Proverbs 19:21

There are many devices in a man’s heart; nevertheless the counsel of the Lord, that shall stand.