Faith And Enlightenment

Deinde ait: Lucerna, inquit, corporis tui est oculus tuus: si oculus tuus simplex est, totum corpus tuum lucidum est; si autem oculus tuus nequam est, totum corpus tuum tenebrosum est. Si ergo lumen, quod in te est, tenebrae sunt; tenebrae ipsae quantae sunt. Lucerna corporis, sensus mentis et fides cordis intelligitur: quae si in nobis pura et lucida fuerit, sine dubio omne corpus nostrum illuminat. Idcirco autem lucerna comparatione fidei ponitur, quia sicut lucerna incedentium in nocte gressus illuminat, ne aut in foveas, aut in offendicula quaeque ambulantes incurrant: ita in hac saeculi nocte splendor fidei omnes vitae nostrae gressus, praeeunte lumine veritatis, illuminat; ne aut in foveas peccatorum, aut in offendicula diaboli incidamus. Hoc est ergo quo ait Dominus: Lucerna corporis tui est oculus tuus si oculus tuus simplex est, totum corpus tuum lucidum est; si autem oculus tuus nequam est, totum corpus tuum tenebrosum est, ostendens, quia si haec fides nostra, quae lucerna corporis vel oculo significatur, in nobis aut peccatorum tenebris, aut perfidiae obscuritate caecetur; sine dubio, omne corpus nostrum obscurum tenebrosumque redditur. Quod ipsum Santus Joannes ostendit, dicens: Deus lux est. Et qui charum habet fratrem suum, ipse est in lumine qui autem odit fratrem suum, in tenebris ambulant, et nescit ubi ambulat quia tenebrae obcaecaverunt oculos ejus. Etsi hoc de eo qui fratrem suum odit, secundum dictum Joannis, intelligitur; in quibus tenebris haereticus demoretur qui, amisso lumine catholicae veritatis, perfidus ac blasphemus existit, debemus advetere. Et ideo ait Dominus: Si lumen, inquit, quod in te est, tenebrae sunt; tenebrae ipsae quantae sunt? In eo scilicet, qui veritatem in mendacium, fidem in perfidiam demutaverit. Alio autem sensu oculum corporis, qui est membris omnibus pulchrior ac pretiosior, epsicopum advertimus significatum, qui clara fidei suae ac doctrinae praedicatione, velut oculus quidam, Ecclesiae corpus illuminat. Qui, si per simplicem fidem ac santam conversationem, catholicus et fidelis doctor exstiterit, potest populus cui praeest, doctrinae ac ac formae ipsius exemplo, in lumine semper vertitatis manere. Verum si is, qui lumen caeteris praebere videtur, per pravam fidem aut per turpem conversationem, nequam et perfidus doctor exstiterit; sine dubio, vitae ac perfidiae suae exemplo, totum corpus potest tenebrosum efficere. Unde non immerito de tali oculo Dominus dicit: Si lumen quod in te est, tenebrae sunt; tenebrae ipsae quantae sunt! Hoc est, si hujusmodi doctor qui lumen fidei ex se praebere caeteris debet, per haeresim obcaecatus, tenebrosus exstiterit; quantae in populo illo possint esse tenebrae peccatorum, debemus advertere. Sanctus Chromatius Aquileiensis, Tactatus XVII in Evangelium Sancti Matthaei Migne PL 20 366-67

Then He said, The eye is the lamp of your body, if your eye is clean, all your body will be light, if your eye is bad, all your body will be darkness. If then the light in you is darkness how great will they darkness be! 1 The lamp of the body is understood as the sense of the mind and the faith of the heart, which if it is pure and bright in us without doubt enlightens our body. Therefore the lamp is compared to faith, which like a burning lamp in the night illuminates our path, lest we walk into a pit or snare; thus in this night of the world the splendor of faith goes before us all the ways of our life, as the light of illuminating truth, lest we fall into the pits of sinners or the snares of the devil. This is why the Lord says, 'The eye is the lamp of your body, if your eye is clean, all your body will be light, if your eye is bad, all your body will be darkness,' showing that as it is our faith which is the lamp, as the eye of the body, so as we are blinded by the darkness of sin or the obscurity of faithlessness, without doubt all our body is made dark and obscure. Which Saint John himself demonstrates saying, 'God is light, and He who has love for his brother is in the light and he who hates his brother walks in darkness and he knows not where he walks because darkness blinds his eyes.' 2 And if this which concerns him who hates his brother according to the speech of John is understood, those dark places in which heretics dwell, who lacking the light of Catholic truth stand in faithlessness and blasphemy, we should avoid. And thus the Lord says, 'If then the light in you is darkness how great will they darkness be.' And certainly in him in whom truth is changed into a lie and faith into treachery. And the eye of the body has another sense in that it signifies him who is of all the members most fair and precious, by which we mean, a bishop, who with the brightness of his faith and teaching is like an eye that illuminates the body of the Church. He who, if by simple faith and holy conduct he stands as a faithful and catholic teacher, can lead his people by the example of his teaching and conduct so that they remain in the light of truth. But if he, who should be a giver of light to others, on account of depraved faith and base conduct, is a wicked and treacherous teacher, without doubt, by the example of his life and faithlessness he is able to make the whole body darkness. Whence rightly the Lord says concerning such an eye: 'If the light in you is darkness, how dark it will be.' That is, if he who should be a teacher who gives the light of faith from himself to others, is blinded by heresy, and stands in darkness, how many, then, of the people will become that darkness of sinners, which we should avoid. Saint Chromatius of Aquileia, from Tractate 17 on the Gospel of Saint Matthew 1. Mt 6.22-24 2. Jn 1.5; 2.10-11