What is this saying? In a nutshell: Use small words. Then, why in the world didn't they say that? Although I don't know, I would guess that it would be to SHOW how confusing BIG WORDS can be. Pride could be another reason, because as we all know, it is far better to be humble than filled with pride.
When in doubt, consider Jesus...
Matthew, Chapter 21 (World English Bible)
1: When they drew near to Jerusalem, and came to Bethsphage, to the Mount of Olives, then Jesus sent two disciples,
2: saying to them, "Go into the village that is opposite you, and immediately you will find a donkey tied, and a colt with her. Untie them, and bring them to me.
3: If anyone says anything to you, you shall say, 'The Lord needs them,' and immediately he will send them."
4: All this was done, that it might be fulfilled which was spoken through the prophet, saying,
5: "Tell the daughter of Zion, Behold, your King comes to you, Humble, and riding on a donkey, On a colt, the foal of a donkey." (emp. added, vss. 4,5 GDR) 6: The disciples went, and did just as Jesus commanded them,
7: and brought the donkey and the colt, and laid their clothes on them; and he sat on them.
8: A very great multitude spread their clothes on the road. Others cut branches from the trees, and spread them on the road.
9: The multitudes who went before him, and who followed, cried, "Hosanna to the son of David! Blessed is he who comes in the name of the Lord! Hosanna in the highest!"
10: When he had come into Jerusalem, all the city was stirred, saying, "Who is this?"
11: The multitudes said, "This is the prophet, Jesus, from Nazareth of Galilee."
AND
Philippians, Chapter 2 (World English Bible)
5 Have this in your mind, which was also in Christ Jesus, 6 who, existing in the form of God, didn’t consider equality with God a thing to be grasped, 7 but emptied himself, taking the form of a servant, being made in the likeness of men. 8 And being found in human form, he humbled himself, becoming obedient to the point of death, yes, the death of the cross. 9 Therefore God also highly exalted him, and gave to him the name which is above every name, 10 that at the name of Jesus every knee should bow, of those in heaven, those on earth, and those under the earth, 11 and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.
Jesus had everything and yet humbled himself for you and me. I guess if that simple thought doesn't make us humble nothing will. Just follow Jesus- and learn what humility really is!!!