That's part of what the Lord said to the church of Sardis, in Rev 3:2, for the entire message, please see Rev 3:1-6.
This is the 5th of seven letters sent by Jesus to actual churches that existed during John's day. These churches are also believed to represent what could be any church at any time, that is, a church could find itself in the very condition that is described in these letters.
It's also believed that the churches in these two chapters may represent the condition a christian might find themselves in.
And, finally, it's believed that these 7 churches represent the entire span of church history, from the early church right on down to the last days church.
So, let's take a quick look at the letter sent to the church of Sardis.
Here's how the Lord described them.
1. They had works, as did the previous 4 churches. Thus they were a working church, they were working in Christ, and for Christ.
2. They had a name that they were alive, but you are dead says the Lord. This may very well mean they were devoid of, or without spiritual life and power. That is, they were a church in name only.
Here's what the Lord prescribed for them.
1. Be watchful and strengthen the things which remain and are ready to die. ( for I have not found your works perfect before God )
2. Remember therefore how you have received and heard:
3. Hold fast and repent.
Here's the warning the Lord gave them.
1. Therefore if you will not watch , I will come upon you as a thief.
2. And you will not know what hour I will come upon you.
Here's encouragement from the Lord to Sardis.
1. You have a few names even in Sardis that have not defiled their garments.
2. And they shall walk with Me in white for they are worthy.
3. He who overcomes shall be clothed in white garments.
4. And I will not blot out his name from the Book of Life;
5. But I will confess his name before My father and before His angels.
6. He who has an ear, let him hear what the Spirit says to the churches.
A few thoughts in reflection and some application.
First of all, they did have works, but, to some degree their were people there who were Christians in name only.
Secondly, the church even though it had it's problems could take the instruction from the Lord and move forward in fruitfulness.
Thirdly, the Lord prescribed the Word for them. To remember the Word they had received and heard. To get themselves, back to the Word of God that had been given to them at one time.
Fourthly, the were to hold fast, ( to the Lord, to His Word, ) and they were to repent, ( that is to change their thinking, and their actions and activities )
Fifthly, there would be consequences if they did not heed the Lord's instruction to them. This is of course is consistent with the patience of God throughout the entire Bible. He is always so patient, and yet if anyone does not take His instruction, they will reap the consequences of that decision. And, so with this particular church as well.
Sixthly, there is much by way of encouragement to be found in 3:4-6. And, there is always much encouragement to be found by the Lord. He details it out in these verses.
Blessings to you.
Pastor Bob Grenier
Calvary Chapel Visalia