Sir 6:1 Instead of a friend become not an enemy to thy neighbour: for an evil man shall inherit reproach and shame, so shall every sinner that is envious and double tongued.
Sir 6:2 Extol not thyself in the thoughts of thy soul like a bull: lest thy strength be quashed by folly,
Sir 6:3 And it eat up thy leaves, and destroy thy fruit, and thou be left as a dry tree in the wilderness.
Sir 6:4 For a wicked soul shall destroy him that hath it, and maketh him to be a joy to his enemies, and shall lead him into the lot of the wicked.
Sirach 6 is harder to divide up. The next section is all about friendship, and quite long, so I broke this out by itself.
Verse 2 speaks of pride and how we should not extol ourselves like a bull. Oh sure, we know there are things we are good at. But we can't forget who gave us those gifts or make sure we employ them properly. We probably shouldn't do that thing that some might do where we sit around and are happy about how awesome we are at something...