Why: but you cannot see this with your own current eyes, I give you a divine eye, behold my divine power, acknowledging directly that ordinary human perception isn't actually sufficient for what's about to be shown.

In life: some truths genuinely require a different kind of readiness or perceptiveness than your ordinary, everyday awareness provides, and that's not a personal failing, it's simply the nature of what's being encountered.

Teaching: if you're struggling to fully grasp something genuinely significant with your ordinary awareness, don't assume that means something is wrong with you, some things really do require a different, cultivated kind of perceptiveness first.