For me, this idea, the idea that I will never stop being a student,
After casting a spell and witnessing the manifestation of my intention I find myself contemplating, "If I am able to manifest (_ fill in the blank _) then is it possible that I can manifest (_ fill in the blank_)? Well, let me consult my familiar Spirits and Ancestors, meditate on it, contemplate the possibilities, and try."
If I were to ever meet someone who identified as Witch and claimed to have learned everything they needed to know, I would wonder about their practice and might just ask them about it because I cannot imagine what that would look like ... what that would feel like. I'm not suggesting that it is not possible (because I believe everything is possible), but I have difficulty in truly comprehending that there could be a limit to the knowledge that is available to a Witch.