"How healing it is, when one discovers the truth that automatic-random-unplanned-involuntary thoughts, while real, normal, and are to be accepted, are initially totally meaningless & irrelevant"
- John Patrick
Gerontologist and Founder, Christian Mental Health Ministries
One a person begins the journey of 'being transformed by the renewal of their mind' (Romans 12:2), through proper use of their mind faculties and the Holy Spirit (the Spirit of Truth), which leads to a state of 'being content in all circumstances' (Philippians 4: 11-13)
A set of faculties that includes consciousness, imagination, perception, thinking, intelligence, judgement, language, and memory (wikipedia)
The Christian's Role/Part
Consciously perceiving (see/notice) their thinking and imagination, and gently judging it for truth (2 Corinthians 10:5)