always be kind
Dealing with depression isn't as simple as some imagine it to be. It's not a matter of just "being happy". Someone can seem outwardly happy, yet still host feelings of sadness, disconnect, isolation, aloneness... the list of emotions is endless.
Depression isn't a situational thing. It doesn't care what your level of success is, how many friends you have, or how close your family is.
It does not discriminate.
It is invisible.
You truly don't know what others are going through, and you don't need to.
Don't tell others "smile" or "cheer up" or worse yet "you look like you lost your best friend". Sometimes that is exactly how it feels.
Just please always try to be kind.