2 Corinthians 10:5
“Christ counts evil thoughts as traitors not only to us, but also to Him. Like the psalmist, you may say, I hate vain thoughts; not only because of the curse they bring to my heart, but for the grief they give to my King. Their intrusion is forbidden by the double barrier of our own choice and the keeping power of Jesus.
“Let the peace of God keep the door of your heart and mind, scrutinizing each intruder and turning back the unfit. Let the Holy Spirit bring every thought into captivity to the obedience of Christ.
“Let the faithful Savior have the keeping of the soul entrusted to Him, that He may watch every menacing thought which lurks in the shadow or steals up the glen. He is well able to keep what is committed to Him. He will not fail the supplicant whose lips are familiar with the prayer: Cleanse the thoughts of our hearts by the inspiration of Your Holy Spirit, that we may perfectly love You and worthily magnify Your holy name.“