White Stallions and Baby Donkeys

This next Sunday is Palm Sunday which is a celebration of when Jesus entered Jerusalem a week before his crucifixion. When I was at church yesterday, the pastor said something that I thought was very interesting. He asked if we were waiting for a white stallion or if we would recognize the man on a baby donkey.
Let me explain what led up to this question. Many times in our life we are searching for a sign from God. We may be looking for the next move in our life or for God to prove a certain point true or false.
In the Bible, the Jews were awaiting the prophesied Messiah. They were looking for Him to come and save their nation and restore it. In Matthew 21, it tells this story about Jesus instructing his disciples in how to prepare for his entry into the city of Jerusalem. He knows that He is the King of kings and Lord of lords. He is a big deal. However, he doesn't order a parade of guards to escort Him into the city. He doesn't search for men to carry Him in a big chair. He doesn't even search for the most beastly white stallion to carry Him. He tells them to go get a donkey colt. This fulfills a prophesy in Zechariah 9:9. "Rejoice greatly, Daughter Zion! Shout, Daughter Zion! See, your king comes to you, righteous and having salvation, lowly and riding on a donkey, on a colt, the foal of a donkey."  A donkey would not gather as much attention. It would actually be humbling because what was a king doing riding a beast of the common people? However, it was as meaningful and powerful of a sign and fulfillment of prophesy as any other.
I know many times I have thought the Jews to be so silly to be demanding a white stallion and conquering king when their Lord was right there before their own eyes. But then again, how many times have I overlooked something God was trying to do or say because I wanted it to be more obvious or perhaps to look more like I wanted instead of Him. How much more faith would I have if I stepped through a narrow door God has given me instead of waiting for it to be flung wide open? As a disclaimer I suppose, I should say it is important to know if we are seeing a door open that really isn't but that is where knowing the Father is so important. Do I have to see a white stallion in order to hear from God or can I accept a baby donkey just the same?