The Lord Himself surely says of Himself: The Spirit of truth who proceeds from the Father (John 15:26). For truly, by saying not 'proceeded' but 'proceeds,' He did not teach a time of the one proceeding, but, with past and future set aside, under the boundless eternity of the present He displayed the power of the procession; so that, just as it is proper to the Holy Spirit to proceed from the Father and the Son, this the catholic faith, even if it does not persuade those who refuse, nevertheless does not depart from the sound rule of its teaching.