To the instruction that I pronounce, for he who keeps it will not be enslaved. Through his lips is the sinner ensnared; the railer and the arrogant man fall thereby.
Let not your mouth form the habit of swearing, or becoming too familiar with the Holy Name. Just as a slave that is constantly under scrutiny will not be without welts, So one who swears continually by the Holy Name will not remain free from sin.
A man who often swears heaps up obligations; the scourge will never be far from his house. If he swears in error, he incurs guilt; if he neglects his obligation, his sin is doubly great. If he swears without reason he cannot be found just, and all his house will suffer affliction.
Keep your father and mother in mind when you sit among the mighty, lest in their presence you commit a blunder and disgrace your upbringing, by wishing you had never been born or cursing the day of your birth.
For burning passion is a blazing fire, not to be quenched till it burns itself out; A man given to sins of the flesh, who never stops until the fire breaks forth; The rake to whom all bread is sweet and who is never through till he dies.
And the man who dishonors his marriage bed and says to himself "Who can see me? Darkness surrounds me, walls hide me; no one sees me; why should I fear to sin?" Of the Most High he is not mindful.
Fearing only the eyes of men; He does not understand that the eyes of the LORD, ten thousand times brighter than the sun, observe every step a man takes and peer into hidden corners.
Such a man will be punished in the streets of the city; when he least expects it, he will be apprehended.
So also with the woman who is unfaithful to her husband and offers as heir her son by a stranger. First, she has disobeyed the law of the Most High; secondly, she has wronged her husband; thirdly, in her wanton adultery she has borne children by another man.
Such a woman will be dragged before the assembly, and her punishment will extend to her children; her children will not take root; her branches will not bring forth fruit. She will leave an accursed memory; her disgrace will never be blotted out.
Thus all who dwell on the earth shall know, and all who inhabit the world shall understand, That nothing is better than the fear of the LORD, nothing more salutary than to obey his commandments.
Sirach 23:7-11, 14, 17-19, 21-27
The first man never finished comprehending wisdom, nor will the last succeed in fathoming her. For deeper than the sea are her thoughts; her counsels, than the great abyss.
Sirach 24:28-29