What the mind or thoughts are upon. As Matt. 16.23; Rom. 8.5; Phil. 3.19; Col. 3.2.
That is, through some medium which, in degree, hinders vision. The word means also 'a mirror,' but it is used for window, made, not of clear transparent glass, as now, but of semi-transparent materials. In this verse, 'know' (partially) is ginosko, the words used for 'know' and 'known' in the last clause of the verse are from epiginosko, which is stronger, as in Matt. 11.27.