Jeremiah 29:11 — "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" — is one of the most quoted verses about purpose. It is worth knowing its context. God is writing to Israelites in exile in Babylon, telling them they will be there for seventy years. His plan for them includes decades of displacement before the restoration. The "expected end" — or as some translations render it, "a future and a hope" — is real, but it runs through circumstances that don't feel like a plan.
The New Testament expands on purpose in terms of calling rather than career. The Greek word klēsis — calling — appears in Romans, 1 Corinthians, Ephesians, and 2 Timothy, and it almost always refers first to the call into relationship with God, not to a specific vocational role. Ephesians 4:1 urges believers to walk worthy of "the vocation wherewith ye are called." The vocation is being a child of God. Everything else flows from that identity. The mistake people make is reversing the order — searching for a vocational purpose as if that will settle the identity question. Scripture moves the other direction: identity first, then faithfulness in whatever is in front of you.
Romans 8:28 — "all things work together for good to them that love God, to them who are called according to his purpose" — is not a promise that you will find a fulfilling career. It is a statement about divine governance: nothing that happens to you is outside the purposeful reach of God. The person who loves God and walks faithfully is, by that very act, living according to his purpose. Purpose is not a destination you find at the end of a search. It is a posture you inhabit right now.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.