The horrible thing about major depressive disorder is that one cannot, in fact alieve that "it gets better" during a bad phase. Depressed people all over the world hate those empty platitudes, are sick and tired of them. Just read any damn forum on depression, seriously!
"Get over it", "hang in there", etc, etc. It comes across as so predictable, so superficial and callous. We've heard this shit a million times; it's just hard for us to draw a connection between some statistical prospect of improvement and the very private grey hell that we are in. I know this from experience. Downvoted. (And yes, it did "get better" for me, but I'm still angry at getting such vapid non-advice.)
Related: http://hyperboleandahalf.blogspot.com/2013/05/depression-part-two.html (the by-now-famous excellent explanation by Allie Brosh)
Speaking as somebody who, over the last couple of months, has literally experienced new emotions ("So that's what that feels like" has been an all-too-common sentiment lately) at the age of 26, depression is... really complicated. I'm still seriously wrestling with whether or not I want to be depressed or not. But I don't think I could again; the experience has been a bit like... stepping from a black and white world to a color one; the colors are blindingly bright and it's kind of unpleasant but I think in the end I'll find this side more sati...
P/S/A: There are single sentences which can create life-changing amounts of difference.