“.... and we take captive every thought to make it obedient to Christ.”2 Cor 10:5.
The human mind is active. Able to think many thoughts in a day. I the process the mind can stray leading to undesirable thoughts. We need to learn how to take captive our thoughts in order to stay positive. Some have said “ You Are What You Think.” Remember; “..You, are not in the realm of the flesh but are in the realm of the Spirit, if indeed the Spirit of God lives in you....” Rom 8:9. Think like one who has the Spirit of God resident in them.
Those born of God like you and me ought have been made new in the attitude of our minds; Eph 4:23. Because of this newness our minds are set on positive thoughts. Therefore, “ if anything is excellent or praiseworthy think about such things.”