The ship sailed in spite of Paul's warning.  They had decided that the port they were at was not a good place to winter, and they wanted to reach Phenice, a haven of Crete, and winter there.  We can warn people of the dangers of continuing on the path they are on, when we know from God's word that it will lead to destruction, but we cannot force them to not continue. As long as lost people think something better lies ahead, they will continue to listen to the world instead of God.  This can even be true of God's people.  We have a plan to achieve greater success, and even when God tells us we are going the wrong way, we continue.  The ultimate result may not be destruction of earthly possessions, but it will destroy our effectiveness for God.  As they set sail, they had a gentle south wind blowing, which led them to believe that they were right and Paul was wrong.  The wrong decision about listening to the world as opposed to God usually starts out successfully.  If temptation, or even disobedience to God, had immediate negative results, we would quickly turn away from it.  God warns us, but then He allows us to make our choice.  Again, there are those who say that whatever happens it is God's will.  As I have stated before, as long as there is free will, then not everything that happens is the will of God.  He allows it to happen, but He does not cause it to happen.  When we find ourselves in a bad situation, we cannot blame God.  Paul was under arrest, on a ship that God had warned him was going to crash, but he didn't put the responsibility on God.  The devil can't make me do it and God will not make me do it, so the responsibility rests with me.  Even when the way starts smoothly, if we know it is not the way God wants us to go, it will end in destruction.  We will not lose our salvation over the wrong choice, but we will destroy our closeness to God.