The way of the world is to worry. God's children should never worry as we are not of this world. God gives us reassurance in Matthew 6:34: "Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of it's own." Also, God reassures us in 2 Timothy 1:7: "For God has not given us a spirit of fear, but of power and of love and of a sound mind."