While I agree with what Monica says about the spiritual significanses of the story of Jonah there are also the natural issues. For with God nothing is impossible.
The Lord spake of parables and used them as well as stories in the natural.
Many times we see that truth is referred to as his word. Temple is his body and so on.
Where those who rely on the meanings of given words and their root forms miss the mark is with the word being spiritually discerned.
When Jesus gave the parable about the seed sowed on 4 types of soil in the natural many walked away thinking he gave a good farming lesson. His disciples whom he chose however were given the spiritual side where the seed is the word and the ground is the heart. That word meant what Jesus said and not Strong's Concordance or any seminary teacher.
The Holy Ghost can reveal the "mystery" as brother Paul said that is what will separate the wheat from the chaff in the end. As written in Psalms 96:13 he shall judge the world with righteousness, and the people with his truth.
Abraham believed God and it was imputed unto him for righteousness and Jesus said sanctify them with thy truth, thy word is truth.
In other words he will judge the world by whether or not they believe and his people by what they believe. Hence, Paul's warning about deceivers waxing worse and worse in the last days.
It says his truth. Not what people want to believe. Not what the dictionary, seminary or concodance says is truth. What he says is truth and reveals by his Spirit.
It is very important that we believe the right thing. The devil can mock everything and make some great sermons that will lead people straight to hell. The Lord will allow it if that is what people want.
It is also written that deceivers would lead many astray with good words and fair speeches.
Sadly too many men today stand behind pulpits and do
this.It may sound great to live your best life now or make every day like Friday but these teachings won't save anyone's soul. They go against the words of Jesus and it's not wise for these men to teach people things that will damn their soul. That is not love of any sort. That is greed and a desire to be as gods like in the garden of Eden.
I agree we cannot read the Bible as a secular book. We need to read it with obedience, reverence, love and fear of the one who died for our sins knowing that it is he who has the power and authority to open our eyes unto the truth or allow us to believe a lie and be damned.
The history, laws and prophets and miracles were all to glorify Jesus and teach us that it is he that pleases God and we can only please God through him.
The riches spoken of are wisdom and knowledge in the word of God and the salvation of our souls. Not worldly gain or fame.
As written, ye are chosen unto salvation through sanctification of the Spirit and belief of the truth.
How can people be saved when they are not sanctified by the Spirit or they do not believe the truth?
Sadly, how many Christians don't even know what being sanctified by the Spirit is?
If they did the multitudes would not be doing the things they are in the name of Christ.
I believe the story of Jonah is both a spiritual teaching as this dear sister said and a warning as well. I also believe that he who spake the world into existance could make a great fish to carry a rebellious servant until he would repent and do as originally commanded.