وَالْعِلْمُ بِهَا مُتَحَقِّقٌ
And knowledge of these realities is attainable or actual.
This does not claim that every person already knows every particular fact about the universe, nor that every human judgment is infallible. It affirms the reality of knowledge as a kind: at least some truths can genuinely be known.
We may recognize a flower's color by perception, learn a fact through reliable reports, or establish a conclusion through reasoning. Ignorance of some matters does not annul all knowledge.
The proposition must not be wrongly interpreted as a universal claim about every possible object of knowledge.