From: The Saviors of God. translated by Kimon Friar
The mind of man can perceive appearances only
and never the essence of things
And not all appearances but only the appearance of matter.
And not even these appearances of matter
but only relationships between them.
And these relationships are not real and independent
of man for even these are his creations.
And they are not the only ones humanly possible but simply
the most convenient for his practical and perceptive needs.