Life is a simple thing. Everything is temporary. 
The only permanent things in life are Education, Memories, and family. 
Education gets you a good job, a good life, and a good family. Memories drag you down but push you along just the same. Your family is what matters most, the people that love you and hold you dear are all that should matter to the world. 
Friends are far from permanent... They come and go as live goes on, leaving you broken and in pain. 
Everything you go through, your career, life, and sometimes even family just passes by... Leaving you with nothing. 
The more you think, the more it hurts. Everything that goes by, happens for a reason... Don't forget that.