Human beings are supposed to be at the highest point of evolution. However, I believe, we evolve as we progress through life, we aren't really evolved at birth. We grow physically, of course, but the real evolution happens in the mind. And we're not infinite beings; like all other things, we have our limits. But we cross these boundaries every time and build new ones, and then cross them again. That's evolution.

When we learn to part with a little of ourselves, and make space for something new, that's evolution. All these things that you go through in life, all the experiences, they're meant for you make space. Just as you need to clean up old books off your shelf to make room for ones, you need to make room for a newer version of you too.

 So you keep leaving a little bit of yourself in every place you go. Sometimes you leave yourself in places you've grown to love, sometimes in a moment back in time, and then sometimes, with some people. And you keep making room for the new.

The funny thing is, the parts you left never become any less significant. You'll be able to feel like that person whenever you visit an old neighborhood, brush through pages of an old photo album, or meet a person you never thought you'd lose. But the new person has inhabited you, and the old one is just a visitor. They'll knock your door ever once in a while, and you'll open the window and greet them perhaps, but you'll never let them in. 

You leave many people behind as you move on in life, but mostly you leave yourself, and you leave yourself so many times without even knowing that you do. And it's always for the better.

Don't be afraid, this is your time to leave, and then come alive again, fresh and new, without the baggage that your previous self had. 

This is, for a change, a happy goodbye.