“up…lower.” In a gathering, the “highest” person in power or rank would occupy the upmost seat or place, with the next highest next to him, then the next highest. The “lowest” place would be for the least honorable guest. Every banquet or festive occasion would have a host or guest of honor, and the seat closest to that person would be the “highest,” while the seat furthest away would be the lowest. It was always best to take a lower seat and have the host say, “Come up,” than to take a high seat and have the host move you down lower. So “Come up,” does not refer to up in height, but “up” closer to the most important person at the gathering (cp. Luke 14:10).
“What your eyes have seen.” This phrase almost certainly belongs together with the first line in Proverbs 25:8. This is supported by almost all the commentators (cp. Bruce Waltke; Roland Murphy; Crawford Toy; and William McKane) and also by many modern versions (cp. CJB; ESV; JPS; NAB; NIV; and more). It is also supported by the Septuagint. Thus, the full verse is: “What your eyes have seen, do not go out to argue about too hastily.”
This is an important verse when considering self-control and taking the time to get the facts of a situation before getting involved. It often happens that when a person hears or sees even a little bit of an argument, he immediately gets involved and takes a side in the argument. The wise person takes the time to gather facts before getting involved in a dispute.