I have not a sound mind. I have a mental illness. How can this be true?
Even if we are children of God, we still are not perfectly loving like Jesus. So, even if we have the spirit
"of power and of love and of a sound mind" (in 2 Timothy 1:7), we still need to become mature and strong in this the way we can be. So, we still need more correction which only God can do in us > Hebrews 12:4-11.
In my case, I have noticed how my mental issues often have to do with how I am mainly concerned about my own self and getting recognition, and how I can react to not getting what I want.
I can be under the power of things I want, and this is not Biblical > our Apostle Paul says >
"I will not be brought under the power of any" (in 1 Corinthians 6:12).
It appears to me that many people's mental troubles are more or less connected to how they can be brought under the power of things around them and things they want. And this is partly because of how in their hearts . . . hearts which are spiritual . . . they have weakness of nature making them able to be destabilized by things . . . either real or imagined. But Jesus makes us strong so things can't get the better of us and be used to control us.
Instead of wishing for surroundings and things and methods and people to satisfy me, I need to become more real in first desiring to please and obey God in His peace > Colossians 3:15. And I need to become much more real in how Jesus has us relating with one another and caring for any and all people.
So, in case my mental issues involve selfish stuff and unloving ways of relating with people, this to me means I need more of how our Father corrects us to relate in His love.
So, my understanding is that if your mental illness includes things which have you mainly caring about your own self, or mainly trying to just use other people for what you want . . . then you need to get stronger in love, and this is why these things can still get the better of you. We all need how God changes our character so we do not give in to unloving things in us, and so things can't be used to control us.
And being sound in our minds includes becoming humble like Jesus > Philippians 2:1-11 tells us to have the mind of Jesus in us.
But . . . also . . . I think of this > we can be saying, oh I'm not like Jesus, I am so terrible, messed-up, failing < but this is not humble, but just criticizing ourselves and our failure . . . so we are not giving our attention to our Father who is able to succeed in us and have us mature in the mind of Christ and how God has us loving and caring for any and all people. So, in case we are not busy with finding out how God has us becoming in His way of loving, this can be why we still are more or less messed up.
Our character can make us weak so we keep giving in to distractions and violating things which keep our attention elsewhere. So, since this is me, in how my mind can function, I need to seek God for how He is able to succeed in us. Methods and control methods are not enough; we need how He cures our nature > Hebrews 12:4-11, 1 John 4:17.