It is a mist, which is seen for a little time and then is gone. But the right thing to say would be, If it is the Lord's pleasure and if we are still living, we will do this and that. You should be ready to go and tell others the good news, what God has trusted us to do - being joyful and passing the joy onto others and taking pleasure in meeting with others who believe the same as you. Once you have been saved by the blood of the lamb, you are his and therefore it is your duty to make your life as Christ-like as possible. God is a just God, and we are guilty sinners.
Faith is in all things - from the beginning and right through our Christian life.
You should not go from faith to works - as if faith got you into a state of grace and that works will keep you in it. You must go from faith to faith, it is by pressing onward through faith that you will gain over unbelief. The apostle begins to show that all mankind needs the salvation of the gospel, because no-one could obtain the favour of God, or escape his wrath by their own works. To be filled with grace and salvation that comes from the mercy of God and which is given to them through Jesus Christ. The cause of that sinfulness is holding to a false truth.