John 1:9
Knowing therefore this, let us continue steadfastly to hold what “they have delivered unto us, which from the beginning were eye-witnesses, and ministers of the word.” And let us not be curious beyond: for two evils will attend those who are sick of this disease, (curiosity,) the wearying themselves in vain by seeking what it is impossible to find, and the provoking God by their endeavors to overturn the bounds set by Him. Now what anger this excites, it needs not that you who know should learn from us. Abstaining therefore from their madness, let us tremble at His words, that He may continually build us up. For, “upon whom shall I look”, says He, “but upon the lowly, and quiet, and who fears my words?” Let us then leave this pernicious curiosity, and bruise our hearts, let us mourn for our sins as Christ commanded, let us be pricked at heart for our transgressions, let us reckon up exactly all the wicked deeds, which in time past we have dared, and let us earnestly strive to wipe them off in all kinds of ways.
Now to this end God has opened to us many ways. For, “Tell you first,” says He, “your sins, that you may be justified”; and again, “I said, I have declared mine iniquity unto You, and You have taken away the unrighteousness of my heart”; since a continual accusation and remembrance of sins contributes not a little to lessen their magnitude. But there is another more prevailing way than this; to bear malice against none of those who have offended against us, to forgive their trespasses to all those who have trespassed against us. Will you learn a third? Hear Daniel, saying, “Redeem your sins by almsdeeds, and your iniquities by showing mercy to the poor.” And there is another besides this; constancy in prayer, and persevering attendance on the intercessions made with God. In like manner fasting brings to us some, and that not small comfort and release from sins committed, provided it be attended with kindness to others, and quenches the vehemence of the wrath of God. For “water will quench a blazing fire, and by almsdeeds sins are purged away.”
Let us then travel along all these ways; for if we give ourselves wholly to these employments, if on them we spend our time, not only shall we wash off our bygone transgressions, but shall gain very great profit for the future. For we shall not allow the devil to assault us with leisure either for slothful living, or for pernicious curiosity, since by these among other means, and in consequence of these, he leads us to foolish questions and hurtful disputations, from seeing us at leisure, and idle, and taking no forethought for excellency of living. But let us block up this approach against him, let us watch, let us be sober, that having in this short time toiled a little, we may obtain eternal goods in endless ages, by the grace and lovingkindness of our Lord Jesus Christ; by whom and with whom to the Father and the Holy Ghost, be glory for ever and ever. Amen.
Source: Homilies on the Gospel of John (New Advent)