‘I chose their way’, meaning not that Job chose to go the way they had gone, but that he made a choice for them of the way that they should go, and they took it. He did this by the counsel he gave which they saw could not be improved on.
‘There is nothing easier for a man than to believe that he will always continue in happiness when he is once in it. We see that David himself confesses: “In my prosperity I said, I shall never be moved” (Psalm 30:6) … David says that he fell asleep from the time that God settled him in the kingdom and made him to prosper, and gave him the upper hand over his enemies, and that after this he reckoned that he would never be moved from this state. “But Lord,” he says, “thou has taught me by experience that only the favour of thy good advances me in this way: for as soon as I felt thy hand, I was in such a plight that I was at my wits’ end.” David then shows that the children of God – although they are not puffed up with pride as unbelievers are – do set themselves in their good fortune, as they term it, and are unable to avoid promising themselves more than is needful. For they imagine that their good days will last forever, and that their prosperity will never fail. Since we are inclined to such vice, so that even David was not clear of it, what else can we do but take heed to ourselves? … David in noting this vice also shows the remedy for it when he says, “Lord the security and safety of both me and my kingdom are grounded upon thy goodness.” If we acknowledge that all our welfare depends on God’s good pleasure, we will conclude that there is no certainty or steadfastness in us. So then let us call upon God and wait at his hand for whatever it pleases him to send us, and although we hope he will continue his goodness towards us, yet notwithstanding let us not cease to prepare ourselves whenever it shall please him to humble us and to exercise patience in adversity. But let us always be ready for it and not think it strange when it comes’ (Calvin – in modern English).
and safety