Who knows whether man’s spirit goes upward and the beast’s spirit down to the earth (Ecclesiastes 3:21).
All that your hand manages to do with your strength, do, for there is no doing nor reckoning nor knowledge nor wisdom in Sheol where you are going (Ecclesiastes 9:10).
The small and the great are there (Job 3:19).
“See how great is the compassion of the blessed Holy One for His creatures! For even if he is extremely wicked, and contemplates teshuvah but cannot do it and dies, he surely receives punishment for having left without teshuvah, but afterwards that desire he felt to perform teshuvah does not depart from the presence of the supernal King, and the blessed Holy One prepares a place for that wicked one in the abode of Sheol, and there he chirps teshuvah. For that desire descends from before the blessed Holy One and breaks all the beams of the gates of the divisions of Hell and reaches the place where that wicked one lies. It knocks him, arousing in him that desire as before, and then that soul twitters and rises from the abode of Sheol” (Zohar 2:150b).
“In truth, to some of them it was a פַּרדֵס (pardes), paradise, and to others it was שְׁמָד (shemad), annihilation. And the secret depends upon the secret of the שֵׁם ד״ (shem dalet), Four Letter Name [of God]” (Rabbi Yosef Gikatilla, Perush ha-Niqqud).