Adam Clarke on Proverbs 30:33

And the wringing - Who hugeli snytith drawith out blood. - Old MS. Bible. This is well expressed in homely phrase. The Septuagint have, "draw the milk, and you may have butter; if you press the nostrils you may bring out blood; and if you draw out your discourse to a great length, you may have strife and contention." Avoid, therefore, all strong excitements and irritations. Coverdale's translation of this verse is very simple: "Whoso chyrneth mylck maketh butter; he that rubbeth his nose maketh it blede; and he that causeth wrath bryngeth forth strife."