I Don't Envy the Grading Aspect of Teaching

I'm a student teacher for freshman drama and I find it really rewarding. Being in the audience and watching magic happen on stage is just priceless to me. But when Mr. Kay actually asked me to grade there scenes it became slightly less fun. It was still fun and completely enjoyable but it's still hard to type in that 7 or 8 in the grade book for a kid you just adore. But you know deep down they didn't do their best or just completely half assed their scene. But I guess I have to put my personal feelings aside and think "It's just business" because I can't live with myself giving them the same grade as someone who worked hard for it vs. you who just went through the motions. It's a very fine line that seems hard not to cross sometimes. I'm very happy and willing to teach them what I know and help them grow; that's what I love about teaching. But the grading aspect I don't envy at all.