Like everything, it's a balance, right? All study and no practice is just as bad as all practice with no study. And sometimes, if you internalize something that you read, you won't often remember where you read it from, so you think you came up with it yourself.

That said, I think it's good to keep yourself in check, since we all probably are pretty voracious readers, and will keep reading, even if it's stuff we already know, just because it's a new article. My recent motto is to produce more than you consume (if it's quality stuff).