One reason to not be lazy is so that you don't get locked into what could be bad habits. I have supervised many students, and i have been the student who was so eager beaver, so industrious, that, in fact, i fell into inefficient habits. So maybe there is no rule about when laziness is good or bad, but i do think that introspecting about why it is that you don’t want to do something on a saturday,. Is always useful. Do you have any mind tricks, please?