5 and every proud thing that is raised up against the knowledge of God, and we take every thought captive to obey Christ. (2 Corinthians 10:5 CSB)
The mind can be the greatest battleground. We can become a slave to a mind out of control. Fear, anxiety, worry, depression; all of these are battlegrounds of the mind.
And consider the physical implications. When our mind is in turmoil there is usually a physical manifestation; weariness, stomach upset, breathing changes….the list goes on and on.
Many chronic physical issues have been linked to mental distress.
Thus we must actively work daily, at times moment by moment, to take every thought captive. If we let the lion run free in the mind it will devour who we are.
When we lift each thought up to Christ we can filter them through scripture and how the Spirit is leading. Prayer is the weapon of choice against thoughts running rampant.