3 Moreover, the Tetrad, explaining these things to him more fully, said:— I wish to show you Aletheia (Truth) herself; for I have brought her down from the dwellings above, that you may see her without a veil, and understand her beauty — that you may also hear her speaking, and admire her wisdom. Behold, then, her head on high, Alpha and Omega; her neck, Beta and Psi; her shoulders with her hands, Gamma and Chi; her breast, Delta and Phi; her diaphragm, Epsilon and Upsilon; her back, Zeta and Tau; her belly, Eta and Sigma; her thighs, Theta and Rho; her knees, Iota and Pi; her legs, Kappa and Omicron; her ankles, Lambda and Xi; her feet, Mu and Nu.
Such is the body of Truth, according to this magician, such the figure of the element, such the character of the letter. And he calls this element Anthropos (Man), and says that is the fountain of all speech, and the beginning of all sound, and the expression of all that is unspeakable, and the mouth of the silent Sige. This indeed is the body of Truth. But do you, elevating the thoughts of your mind on high, listen from the mouth of Truth to the self-begotten Word, who is also the dispenser of the bounty of the Father.
Source: Adversus haereses (New Advent)