All scripture is God breathed and useful!
That is a common passage, but verse 17 is very important also.
We don’t look to the Bible to be condemned and have a “woe is me” mindset because we have messed up or we are not living up to the high calling we have as believers.
On the contrary!
verse 17 says
The servant of God will be thoroughly equipped for every good work!
Don’t feel defeated by sin or a big calling God has given you, but be encouraged by the scripture!
It is there to build us up to do good work.