Riddle of Seen and Done

Again, an easy riddle. I'm taking a few days to come up with one or two good ones, but in the meantime feel free to peel the layers off of this. Good luck. Keep thinking. Blah, blah, blah.. Who/What am I? I am pure. I am absolute, fixed, yet also relative. I am always the same, but I will forever change you. Nothing can deny me, but you would not want to, even if you could. I was with you until you took a new path, a new route, but you still need me. You've always needed me, and you always will, and I will never leave you..at least, as long as you never leave. And, where are you going with your ship, exactly [b][i]Winner:[/i][/b] [spoiler]x71555[/spoiler] [b][i]Answer[/i][/b] [spoiler]Experience[/spoiler] [b]Explanation:[/b] [spoiler]It's pretty straightforward and I'm lazy[/spoiler] --- If you love this sort of thing, join a hundred others who do too! Destiny Riddlers is a group dedicated to solving, guessing, and discussing riddles. Join us to easier track our riddles and to better participate in them!