He is the First and the Last, the Outward and the Inward. And He knows all things.
هو الأول والآخر والظاهر والباطن ۖ وهو بكل شيء عليم
Hüve'l-evvelü ve'l-âhiru ve'z-zâhiru ve'l-bâtın, ve hüve bi-külli şey'in alîm
The Holy Qur'an, Al-Hadid 57:3 (meaning).
Four names, two pairs of opposites.
The first and the last, the seen and the hidden.
The verse gathers them in a single Being.
The name the Outward is the visible face of the Treasure; the name the Inward is the depth that stays concealed.
One cannot be understood without the other.
Seen in all things, hidden in all things; because He is everywhere, He can be shown nowhere.