John Chrysostom

And, to show you that he was as it were in solitude, and so looked upon the things present, hear himself saying, "While we look not at the things which are seen, but at the things which are not seen." What sayest thou? Answer me. And yet what thou sayest is the contrary; thou seest the things invisible, and the visible thou seest not. Such eyes as thou hadst gotten, such are the eyes which are given by Christ: for as these bodily eyes see indeed the things that are seen, but things unseen they see not: so those heavenly eyes do the contrary: no one that beholds the invisible things, beholds the visible: no one beholding the things seen, beholds the invisible. Or is not this the case with us also? For when having turned our mind inwards we think of any of the unseen things, our views become raised above the things on earth.