Yet you have a few people in Sardis who have not soiled their clothes. They will walk with me, dressed in white, for they are worthy. (Revelation 3:4)
God asks for purity in the lives of believers and there is always a blessing attached to them who strive to live a life pleasing to the Lord. Not an easy task but achievable with the help of the Holy Spirit. Of course, sins and short comings do come in the lives of all believers, but God is always willing to forgive and help us go forward.
The Church at Sardis in Asia Minor during the days of John the Apostle, had a few faithful believers and it was accounted by the Lord. But most of the people in the Church there were in a bad spiritual condition and this is what God had to say to them,
I know your deeds; you have a reputation of being alive, but you are dead. (Revelation 3:1)
God wanted to them to repent and said,
Wake up! Strengthen what remains and is about to die, for I have not found your deeds complete in the sight of my God. (Revelation 3:2)
He also issued a warning if they did not repent.
Remember, therefore, what you have received and heard; obey it, and repent. But if you do not wake up, I will come like a thief, and you will not know at what time I will come to you. (Revelation 3:3)
Sadly, they did not repent and the Church did not last very long. But the faithful were promised by God with this eternal promise:
They will walk with me, dressed in white, for they are worthy. (Revelation 3:4)
To us the Holy Spirit says,
He who overcomes will, like them, be dressed in white. I will never blot out his name from the book of life, but will acknowledge his name before my Father and his angels. (Revelation 3:5)
May the Lord Jesus Christ help us all in this endeavour.