I saw this documentary about Einstein and it was quite funny, or the implication was, because once he saw the logic that to lead to e=mc squared, he spent quite a bit of time going, “huh, really?!” to himself, and it is quite likely that this was stretched out over a fair span of time just prior to, and ongoing, after the initial revelation. The consequences of it being accurate were radical, to say the least.
Sometimes profound things are like that. They hit you and you just keep going back to them in an attempt to reconcile what is new, like refocusing binoculars or rubbing your eyes, upon seeing something very shocking.