Dante Alighieri 
The Divine Comedy: Paradise 

The glory of Him who moves everything penetrates through the universe, and shines in one part more and in another less. In the heaven that receives most of its light I have been, and have seen things which he who descends from thereabove neither knows how nor is able to recount; because, drawing near to its own desire, our understanding enters so deep, that the memory cannot follow. Truly whatever of the Holy Realm I could treasure up in my mind shall now be the theme of my song.