Darkness
Remember one thing there is always Darkness just beneath the source of the light just as we can see in the above photo there is Darkness beneath the Lamp . So the Same theory sometimes works on the Human-Being , the Person who seems to be the Most Happiest person from the Outside is being the Loneliest Person from the Inside . So Sometimes If you see a person who is happy all the time , Sometime that person can be faking it , because that person doesn't want to express their loneliness to the outside world just because of they are afraid that they would look so vulnerable or miserable , and if you know that person very well than you need to help that person to come out from that situation , And make that person understand that there is no need to faking all the time that they are happy , that's okay to be feel low sometimes .