what is to be known, but leaves it unspecified. Yet everyone will come to know something they did not previously know.

The answer is that the context conveys warning and threat, since He begins by saying:

“Competition for more has distracted you.”

Moreover, such language has conventionally come to be used chiefly to convey a threat, or else a promise. Since the knowledge in question is delimited by the wording of the context and by conventional usage, His words:

“If you knew”

refer to that same knowledge. He foretold that it would occur in the future, then made its occurrence in the present the condition, specifying that the knowledge constituting this condition must be knowledge of certainty. For they may have knowledge of what comes after death, but not knowledge that amounts to certainty.