Successful thinking is thinking that is in line with the grace of God and the life of grace. The only thing stopping you from seeing the intended fruit of grace manifesting in your life is an attachment to self-effort and trying to obtain the benefits of salvation through your good works. Your relationship with God is based on what Jesus did, not your own righteousness. When you begin to understand this, you will see the fruit of grace begin to show up in your life like never before.