Proverbs 16:9 — "A man's heart deviseth his way: but the LORD directeth his steps" — describes a collaboration between human planning and divine guidance. The Hebrew word for "directeth" — kun — means to establish, to make firm, to prepare. God does not do the planning for the person; the person plans. But God is active in the establishing of the actual steps that result. This is not fatalism — the person is responsible to plan and think. It is also not self-sufficiency — the actual direction of the path involves God's agency.
Ecclesiastes 9:10 — "Whatsoever thy hand findeth to do, do it with thy might" — establishes the theological dignity of committed work. Whatever the occupation, the call is to full engagement. Paul applies this in Colossians 3:23: "whatsoever ye do, do it heartily, as to the Lord." The word "heartily" — ek psyches — means from the soul. The career is the site of soul-engagement with God, not merely a means to income.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.