1:15 - So they picked up Jonah, threw him into the sea, and the sea stopped its raging.
Our obedience stops the pressure to obey. Huh! In this case, the man that God was pressuring still had more pressure to deal with, but the collateral damage to the sailors was stopped as the discipline from the Lord had its desired affect: Jonah's isolation.
1:16 - Then the men feared the Lord greatly, and they offered a sacrifice to the Lord and made vows.
From an act of faith (v.15), salvation comes from the Lord. Here is another great example of salvation by grace through faith. James 2:18 - But someone may well say, “You have faith and I have works; show me your faith without the works, and I will show you my faith by my works.”
Rom. 8:28 comes to mind here with caution from Rom 6:1. God works good out of our disobedience, but our disobedience is not from God nor is it working the works of God. Nobody can justify sin just because God brought good out of it.