(Proverbs 21:12 KJV) The righteous man wisely considereth the house of the wicked: but God overthroweth the wicked for their wickedness.
(My software is not responding but I think I have found a source of the words in italics again.)
By comparing the KJV and NASB and considering the word in italics we come across a source of a question. Keep in mind that good printings of the KJV have words in italics and the same for the NASB. That is to show that the actual words are not in the original but are added for clarity. Sometimes they also raise questions.
Notice that the KJV says “righteous man”. The word “man” is not in the Hebrew, only the word righteous but it is a noun. The NASB says “righteous one”.
Then you get to the second part of the verse. The KJV says “but God” and both words are in italics. They are not in the Hebrew. The NASB simply implies it is the same subject as the first phrase.
The question? Who is the actor in this drama? Is it the righteous, upright person or The Righteous One? If it is the believer, then we have a responsibility. If it is God, we are simply reassured that He sees all and will bring justice.
So? Are you feeling on fire? Assume it is a charge to you. Are you out of gas? Let the Lord take care of it. Based on other verses, either response is acceptable. Maybe a combination of the two is the real answer. Act in obedience and trust the Lord to work it out.