وَالْعِلْمُ بِهَا أَيْ بِالْحَقَائِقِ مِنْ تَصَوُّرِهَا وَالتَّصْدِيقِ بِهَا
Knowledge of realities includes conceiving them and assenting to propositions about them.
Conception grasps a meaning; assent affirms a judgment. Their mention helps prevent a mistaken reading of “knowledge of realities” as total knowledge of every individual and every species.
No human being comprehends all particulars. Yet that limitation does not imply that no reality can be known.
A universal denial of knowledge can be resisted by establishing genuine knowledge of some things; omniscience is not required.