"A glad heart makes a cheerful face,
but by sorrow of heart the spirit is crushed."  Proverbs 15:13
And,
A joyful heart is good medicine,
but a crushed spirit dries up the bones."  Proverb 17:22

I*s it any wonder that Scripture tells us to 'be anxious for nothing, or to fret not'?

Webster's Unabridged Dictionary defines anxious as: full of mental distress or uneasiness because of fear of danger or misfortune; greatly worried; troubled.
Fret is defined as: to feel or express worry, annoyance, discontent.  To torment, irritate, annoy or vex.  To gnaw, corrode, wear away.  

Can you see why we are not to focus on circumstances and not to give in to anxiety and fretting?
They break the spirit and actually do great physical harm to the body.

Jesus said, 
"Peace I leave with you; My peace I give to you; not as the world gives; do I give to you. Let not your heart be troubled, nor let it be fearful."  John 14:27

And He said that we would have tribulations in this world, but He has left us with His victory. 
"These things I have spoken to you, that in Me you may have peace.  In the world you have 
tribulation, but take courage; I have overcome the world."  John 16:33

We go on to see in 1 John 5:4-5'
"For everyone who has been born of God overcomes the world.  And this is the victory that has overcome the world---our faith.
Who is it that overcomes the world except the one who believes that Jesus is the Son of God."

The Apostle Paul gives us this antidote forn the heart that is anxious (I'm sure you know the Scripture I have in mind):
"Be anxious for nothing, but in prayer and supplication wi8th thanksgiving let your requests be made known to God.  And the peace of God, which surpasses all comprehension, shall guard your hearts and your minds in Christ Jesus."  Philippians 4:6-7

Paul does not stop there, he goes on to tell us the things our minds should dwell on.  Look closely, these words describe our Lord Jesus Christ!
"Finally, brethren, whatever is true, whatever is honorable, whatever is right, whatever is pure, whatever is lovely, whatever is of good repute, if there is any excellence and if antthing worthy of praise let your mind dell on these things."  Philippians 4:8

When the heart is at peace, it can't help but be cheerful and full of joy!
""These things I have spoken to you, that My joy may be in you, and that your joy may be full. John 15:11

May the joy and peace in your heart reflect in a cheerful countenance for all to see!
Blessings to all.  Amen