What does the expression "serving two masters" and "being anxious" have in common? They both have the same root problem--being divided within oneself.
The root word for anxiety literally means being of two minds. An anxious person is often tossed to and fro and paralyzed by fear, indecision, and insecurity. Fear of some bad outcome cripples those afflicted with anxiety.
Who is the master in charge of your life? Our master is whatever governs our thought-life, shapes our ideals, and controls the desires of our heart and the values we choose to live by. We can be ruled by many different things--the love of money and possessions, the power of position and prestige, the glamor of wealth and fame, and the driving force of unruly passions, harmful desires, and addictive cravings. Ultimately, the choice of who is our master boils down to two: God or "mammon." What is mammon? Mammon stands for material wealth or possessions or whatever tends to control our appetites and desires.
Ref: Our Daily Bread