A "work" is simply doing something. The opposite of a work is being passive.
The Jews took this to the extreme concerning the Sabbath. Jesus did not consider some things as servile work. For example: Helping your neighbor pull it's animal out of a ditch was not considered servile work to God.
Repentance is indeed a work. It is not a work done apart from God on an island so to speak (for it is wrought through GOd's influence on the heart through the light of conscience).
Is breathing a work?
Is eating a work?
Is sleeping a work?
Is going to the bathroom a work?
All these things above would be considered one in doing something.
But they are not the types of works that Jesus would have us to do.
It is a tragedy that "works" is a dirty word when used in conjunction with salvation to many.
Works is not a "dirty word." Works must be present in a believer's faith or it is a false faith. But works do not save you in and of themselves. Works is just the by product of having been saved.
There are first works which must be done.
Rev 2:5 Remember therefore from whence thou art fallen, and repent, and do the first works; or else I will come unto thee quickly, and will remove thy candlestick out of his place, except thou repent.
Notice what this passage says.
Repent.
God did not say, do the first works and then repent.
Repentance comes first.
Why?
Because repentance brings Salvation (Jesus Christ).
Like I said, when you repent for real, then God can work in your heart and life.
For you have to understand that a person who backslides into sin cannot do anything for God unless they repent.
For when we are broken before God is when He can move within our lives so that we can do the first works (By allowing Jesus to work within us). For Jesus said in John 15, that we can do nothing without Him. It's not you that is saving you. Your works as a true believer are ultimately the works of God. For Galatians talks about how we are to have the fruit of the Spirit. It does not say that these fruits are of the believer.
Revelation 2:5 is not teaching salvation by works.
It is teaching salvation (by repentance) which will allow us to let the Lord work within us.
Revelation 2:5 is written from an outward or external perspective of what they needed to be like.
Repentance is that first step that would get them there.
Repentance to Jesus (Salvation) = (or results in) Works.
Not Repentance + Works = Salvation.
Faith itself is a work because it is the dynamic of yielding to God from the heart. Faith is something we do.
Hebrews 11 is the famous Heroes of faith chapter. In this chapter we learn that there is a very close relationship to faith and works. That by faith, such and such person did such and such action or work. What the writers is saying is that works proceed from faith. In James chapter 2, we see James hammer this point home. That a true faith will always have works. A false faith will not have works. For a faith no works is a dead faith. Works justifies or shows true a person's saving faith. It proves that God transformed your heart and proves that you have been allow Him to do the good work within you.
1Th 1:3 Remembering without ceasing your work of faith, and labour of love, and patience of hope in our Lord Jesus Christ, in the sight of God and our Father;
Yes, works proceed out of faith. But this passage does not actually say that works is saving you.