Jesus is comparing God’s glory revealed in the goodness of creation to King Solomon’s splendor. So what is Solomon’s splendor? Deuteronomy 17 goes into detail about how NOT to be a king. Specific stuff about how the God who hears the cries of slaves is anti-slavery, anti-arms dealing, anti-idolatry and anti-wealth accumulation. King Solomon does all these things. Like he was ticking off a checklist.