He is the knower of the known and the unknown, the mighty and most high.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (he is the knower of the invisible) that which is unseen by the people (and the visible) that which the people know; it is also said that the invisible refers to that which will happen in the future while the visible refers to that which has already happened, (the great) there is nothing greater than him, (the high exalted) there is nothing more exalted than him.
Jalāl al-Dīn al-Maḥallī
تفسير : [he is] the knower of the unseen and the visible, [of] what is hidden and what is witnessed; the great, the tremendous, the high exalted, above his creation, through his [overpowering] subjugation (read al-muta‘ālī or al-muta‘āl, ‘the high exalted’).