"Man is free at the moment he wishes to be." - Voltaire

I think what this means is that if you hold yourself prisoner when you don't let go of things, or if you don't forgive someone for whatever reason. The moment you want to be free from all of that stress, all you have to do is to let things go. Be more mellow, do something relaxing or anything, really that will help you to let something go. Then you can hold on to that inner peace you now have. 

There is no reality, only perception

"Better keep yourself clean and bright; you are the window through which you must see the world." -George Bernard Shaw 
I think that what he said means that how you see the world, is how it is for you. It might be different for other people, because the PERCIVE it differently. Everyone thinks differently, so everyone's life is different. If you don't like how your life is then change the way you think about it. If you act like you don't like your life, then that is how your life is gonna be. You aren't going to like your life if you stick with that attitude. 

"Never let the fear of striking out get in your way." - Babe Ruth

 If you want to do, or say something then just do it. Don't let other people get in your way, don't let the word No stop you from being yourself. If your friends don't agree with your true self, then they were never true friends.