Stoic was a porch in ancient Athens where a man named Zeno taught that man should be free from passion, unmoved by joy or grief, and submit without complaint to the unavoidable necessity by which all things are governed. The Stoics believed that this concept of contentment was reached when you had come to the point of total indifference when you were indifferent to everything, then and only then would you be content.
Paul learned the secret of being content. It was not numbness, the absence of emotion, or a denial of the realities of the world.
…I have learned in whatever situation I am to be content. I know how to be brought low, and I know how to abound. In any and every circumstance, I have learned the secret of facing plenty and hunger, abundance and need. I can do all things through Him who strengthens me. Philippians 4:11-13
The Christian life comes with a survival kit to get through every difficulty of life. We have strength found in Jesus. We are content when we are at peace with Him and thankful for every blessing He has gives us. Whether wealthy or broke, unless we let God satisfy us, we will never truly be content. Contentment is not based on your possessions, but on who possesses your heart.
The ultimate summary of Paul's secret of contentment:
…everyone born of God overcomes the world. This is the victory that has overcome the world... 1 John 5:4