Purity

I've been thinking lately about purity, mine in particular. I consider myself to be fairly pure because of somethings that I have let slip by. Shows and movies I have allowed myself to watch or friends and relationships that weren't focused on giving God glory. But then I think, how can something be "fairly pure". Isn't purity something that either you are or you aren't, you can't be "somewhat pure", can you? Well, either way, all I can say is that I am very great full I have Jesus and His purity.