The big picture of 1 John was written…
So that we may have fellowship with God and one another
So that we may not sin
Because we know the truth
Because there are those trying to deceive us.
So that we may know we have eternal life.
Knowing we have eternal life gives us confidence before God.
If we ask God for anything He hears us and gives it to us according to His will.
If we see a God-believer commiting sin not leading to death we ask God to give him life. We can be sure that He hears us and gives us what we ask.
There is a sin leading to death we are not obligated to pray for that.
Sin not leading to death vs sin leading to death. Possible interpretations:
Physical death
Blasphemy of the Holy Spirit
Apostasy
Those who were from us but not of us.
The final three assurances in 1 John
We know that all believers are secure and protected by God from the evil one.
We know that the whole world lies in the power of the evil one
We know that the Son of God has come that we may know him and have relationship with him.