Philippians 3:16 says, Nevertheless, whereto we have already attained, let us walk by the same rule, let us mind the same thing.  Paul told the Christians to walk according to the salvation that they had already attained by faith.  They were not to obey God to attain salvation, but because they already had by accepting Jesus as their Savior and Lord.  Like them, we are to walk in obedience to our faith, not to attain salvation, but because as followers of Christ, we have already attained it.  Verse seventeen states,  Brethren, be followers together of me, and mark them which walk so as ye have us for an ensample.  Paul said that they were to look to him as an example.  At this time, he was imprisoned for his faith.  Of course, Paul did not say that he was the only one that they could use for an example of faithfulness to Christ, but he did say that any others that they used should walk in faith as he did.  I believe too often today we use those who profess to follow Christ and are very successful materially as examples to follow.  At times, they may even encourage us to use them as example if we want to be materially successful, but we were never promised material success in the world, so I believe that we need to be wary of them.  It is not impossible to be a Christian and be rich, but when someone declares that if we are faithful enough to Christ that He will make us rich, then they need to look at Paul, who instead of being rich was imprisoned.  Verse eighteen adds,  (For many walk, of whom I have told you often, and now tell you even weeping, that they are the enemies of the cross of Christ:  Then verse nineteen concludes, Whose end is destruction, whose God is their belly, and whose glory is in their shame, who mind earthly things.)  I believe that this is as clear a warning as there can be that not all who profess to be Christians really are.  Paul said that he had already warned the followers of Christ at Philippi about them, and that he did so with weeping.  Paul said that these who professed to follow Christ but didn't were ruled by their belly, or material things.  We need to be just as concerned about those who proclaim any way of faith other than the way of the cross.  If we are only following Christ for material success, then we are attempting to follow for the wrong reason.  Verse twenty declares, For our conversation is in heaven; from whence also we look for the Saviour, the Lord Jesus Christ:  Paul said their conversation was in heaven from whence they looked for the Savior, the Lord Jesus Christ.  Paul was referring too all those whom it was good to follow as an example.  Our life today should point others to Jesus Christ and should always be lived in obedience to Him.  Verse twenty-one adds, Who shall change our vile body, that it may be fashioned like unto his glorious body, according to the working whereby he is able even to subdue all things unto himself.  I believe that Paul was referring to a change that will occur as soon as we accept Christ as our Savior and Lord.  Though we may still live in this same old body for the rest of our life, we are to become a new creature by Christ.  Though we will not be perfect, we are a part of the family of God from the day we accept Jseus Christ as our Savior and Lord, and it should change our very nature.