What can a smile do?
Most people know that a friendly dog will wag its tail when you approach or speak to it. If the dog doesn't wag its tail, you hesitate, not knowing if it's friendly or not. When a dog wags its tail, it's like a smile. It tells you the dog is friendly.
When a person doesn't smile, even though they aren't necessarily frowning, it sends an unfriendly signal. A reasonably intelligent person knows not to approach a dog that doesn't wag its tail. At the same time, a person is also a bit reluctant to approach another person who doesn't smile.
As a Christian, I know Jesus wants us to think happy thoughts. Happy thoughts create positive energy.
"But let all who take refuge in you rejoice; let them sing joyful praises forever. Spread your protection over them, that all who love your name may be filled with joy. For you bless the godly, O Lord; you surround them with your shield of love." (Psalms 5:11)
"If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love. These things have I spoken unto you, that my joy might remain in you, and that your joy might be full (John 15:10)
Of course, a person who smiles ALL of the time is probably in La-La land. Dogs don't go around wagging their tails all of the time. It is a friendly response reaction. A smile is the exact same thing.
However, a smile also makes a big difference in a person's appearance. It makes a person look younger, happier, and more confident. It can also make you feel better. People use more muscles to frown anyway. The next time you get frustrated, yet there's little if anything you can do about it, smile when someone approaches you and believe it or not, you will start to feel better.
Therefore, when someone approaches you, give them a smile, sending a signal to them that you are friendly. People usually respond better to a smile than a blank expression. It's just like approaching a dog. If the dog is not wagging its tail, the person has no idea what their temperament is. If your expression is blank, or maybe a bit of a frown, a person can feel leery of approaching you.
If you doubt that a smile makes you look better, go through some pictures of yourself, or take some new ones. Look at yourself when you're smiling. It's a good bet that you will look younger when you're smiling. A smile will make a big difference in the way you look and feel. It will also make you more approachable.
Of course, if you just don't like smiling, you can always wag your tail.
Ha, ha, made ya smile!