hidden

138. Pride holds the first place among the deadly sins, and St. Thomas not only places it amongst the deadly sins, but above them, as transcending them all, the king of vices which includes in his cortège all the other vices, therefore it is called in Holy Scripture: "The root of all evil," [Tim. vi, 10] "The beginning of all sin." [Ecclus x, 15] because as the root of the tree is hidden under the earth and sends all its strength up into the branches, so pride remains hidden in the heart and secretly influences every sin through its action. Therefore whenever we commit a mortal sin, we are in reality opposing and directing our own will against the will of God.
Job speaks thus of the sinner: "He hath strengthened himself against the Almighty," [Job xv, 25] and in this sense one can also say of pride that it is the greatest of all sins, because the proud rebel against God, setting themselves in opposition to God, nor do they mind displeasing God in order to please themselves, leaving the All to attach themselves to their own nothingness, as St. Augustine says: "Abandoning God, he seeks his own will, and by so doing draws near to nothingness, hence the proud according to Scripture are called doers of their own will," [Lib. IV, De Civ. Dei, cap. xiv] which is to say with St. Paul: "Lovers of themselves." And the same holy father makes this reflection, that even venial sins committed more from frailty than from malice may become mortal if they are aggravated by pride. "Sins creep in through human weakness, and although small they become great and heavy if pride adds to their weight and measure." [Lib. de Sancta Virginit. cap. ii]
But since God has sworn to detect this vice: "The Lord God hath sworn by His Own Soul, I detest the pride of Jacob," [Amos vi, 8] what wonder is it that He should punish it more than all vices? St. Augustine remarks with singular force that amongst all the sins by which sinners fall, none is so great, so ruinous, or so grave as that of pride. "Amongst all the falls of sinners none is so great as that of the proud." [Ps. xxxv]