No one can serve two masters; for either he will hate the one and love the other, or else he will be loyal to the one and despise the other. You cannot serve God and mammon.
The love of money as a root of all types of evil (1st Timothy 6:10).
Example: Paul’s attitude of honesty in collecting and taking gift to saints in Jerusalem (2nd Corinthians 18- 21; esp. verse 21: providing all things honest, not only in the sight of the Lord, but also in the sight of men).
In addition to handling money faithfully, it is coming to a state of heart where the ownership or use of money is free from the insidious love of or trust in it. It includes
Do not overwork to be rich; because of your own understanding, cease! Will you set your eyes on that which is not? For riches certainly make themselves wings; they fly away like an eagle toward heaven (Proverbs 23:4-5)