Commit thy works unto the LORD, and thy thoughts shall be established.
(Prov 16:3)

I believe the writer of the Proverbs (most likely Solomon) is talking of more than our occupation, may it be in our jobs, as homemakers, as a minister, missionary, etc. We tend to segregate ‘full-time’ and ‘secular’ lives. David Pawson said that there is no such thing; as long as we are Christians (followers of Christ) we are full-time Christians in whatever occupation we are in. We are to be consistent in our witness of being light of world (Matt 5:16). If we separate than we adopt the Greek (humanistic) philosophy of dividing the spiritual from the physical which leads to double lives. Our children can see through our hypocrisy if we live this way, having one behavior in church and another at home and worst behavior at work or with our friends. The obvious thing is in our speech splattered with ‘hallelujahs’ and another time with curses (Jam 3:10). If we live in this manner then we are the salt that has lost its savor (Matt 5:13). Salt remains as salt wherever it is. When Jesus talked about salt in His days, its use is for more than preservation but in agriculture where salt in the form of potash was used as fertilizer. Therefore Jesus was talking more than preservation but also of growth and fruitfulness. Therefore ‘works’ is more than occupation but encompasses our entire life which can be either hot, cold or lukewarm (Rev 3:15).

A double minded man is unstable in all his ways.
(Jas 1:8)

Double mindedness literally means double souled, having one soul towards God and the other towards something else. James is obviously referring to Christians because the unbeliever would not have one’s soul given to God. Here is where we can live schizophrenic lives, neither hot nor cold which results in God’s rejection (Rev 3:16). I dare not imagine the sorrow of God’s rejection yet this is what Jesus (not the apostles) said in Matt 25 because the truth is that God’s rejection is an everlasting one.

Draw nigh to God, and he will draw nigh to you. Cleanse your hands, ye sinners; and purify your hearts, ye double minded.
(Jas 4:8)

The remedy to living double soul lives is given to us in the form of repentance. Firstly humbly coming before God acknowledging our wretchedness as sinners (remember James is talking to Christians!) and cleanse our hands (our works) and purify our hearts (where it all begins). It is no wonder that our thoughts are unstable, filled with doubts, fears, self, sensitive, etc because there is no establishment in God. We need a renewed mind where our entire life is lived in accordance to God’s satisfaction (Rom 12:1, 2).

Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee.
(Isa 26:3)

When our thought life is founded on God that is when we are at peace though there can be a raging storm (economically, turmoil, etc) around us (Psa 91:7), this is when our thoughts are established (firmly grounded and unshakable).