On the day that YHVH rejoice with the Tzadikim, they will achieve the level that is close to the Holy One Blessed Be He. Their wisdom will increase with clarity as if they can see it with their eyes.
The soul and the body will both rejoice with the pleasures of enjoying the higher knowledge of the Creator and the presence of the Shechina. This is the ‘good’ that God saved for teh Tzadikim.
“וְאֵלֶּה תּוֹלְדֹת יִצְחָק, בֶּן-אַבְרָהָם: אַבְרָהָם, הוֹלִיד אֶת-יִצְחָק.”
“Now these are the records of the generations of Isaac, Abraham’s son: Abraham became the father of Isaac;”
These are the records of the joy and laughter that would be in the world on that time.
‘Abraham’s son’ is the soul that have the merits to be complete in its level.
‘Abraham became the father of Isaac’ is the is the aspect of the soul that brings out joy and happiness in the world.
The revelation here is that the people with merits would be able to enjoy the greater wisdom that would be revealed in the world and also great pleasures of the body.
The body worked to serve the soul during many life times and in the end it will rewarded with abilities to enjoy great pleasures.
Because we have only temporary time in this world, we should focus on working to earn merits for the world after the Mashiach cleanse all negativity and the Shechinah reveal its full light. Working hard for one lifetime, is worth the immortality of the future.