Paul is writing to the Galatians’ Church to encourage them to persevere in the faith. 

They were being led astray by false teachers who were adding burdens to the Gospel.  Paul impressed upon them the simplicity of the Gospel and the freedom that comes with faith in Christ.  
 
We live in  similar times, the Gospel message can get lost in our information world. The simplicity of the Gospel can get complicated by a complex world.  The Gospel still sets us free.