Thinking Ability to Protect You
Proverbs 5:2 Updated American Standard Version (UASV)
2 that you may keep discretion,
and your lips may guard knowledge.
 Or thinking ability; the ability to give wise and careful attention (study) of a matter, based on accurate or full knowledge
That you may keep discretion: The phrase discretion (i.e., thinking ability) has been used in 1:4; 2:11; 3:21. In all four verses, the phrase is referring to the ability to make wise choices as well as use good judgment. Discretion (thinking ability): (Heb. mezimmah) In the evil sense, this can mean wicked plans, evil ideas, schemes, and devices. In the favorable sense, it can mean shrewdness, perceptiveness, discretion, and prudence. In the favorable sense, it is the ability to judge wisely and objectively. Mezimmah, therefore, the human mind and thoughts can be used for an admirable and upright end, or for evil purposes. – Ps 10:2; Pro. 1:4; 2:10-12; 5:1-2.
And your lips may guard knowledge: The lips (śā·p̄ā(h)) here, which is serving as a protection, guarding or watching over our knowledge is being contrasted with “the lips of a forbidden woman” in the next verse. In other words, your lips should be filled with wise words that will serve as a protection in contrast to the flattering lips of an adulteress.
In order to possess the good sense or the good judgment and the sensibility needed to avoid what we will label as innocent appearing situations, that is, it seems innocent enough, but it is really a dangerous situation that can lead to ultimate downfall; the young one needs to see where there may not even be evidence that there is seduction in the air.
An older woman may use cunning, smoothness, and crafty ways to slip into the affections of an inexperienced young man in the ways of the world. Being innocent, the young man may not perceive her charms. Once he is seduced, he may still find it difficult how he fell into the disgraceful situation that brought about this ultimate wrongdoing. Many young men have lost themselves to the seductive woman, being sexually exploited.