What I learned from clerking for Judge Guido Calabresi and for Justice Steven Breyer was that there is no position, regardless of how wrong you think it is, that does not have some arguments in its favor, and you have to find them. And then, no matter how right your own position is, you must look for the weaknesses in that they are always there. You must be willing to find them and possibly change your approach or your mind on the subject.