To think on is to continue to consider or ponder something.
Phil.4:8 (AMP) Finally, [a]believers, whatever is true, whatever is honorable and worthy of respect, whatever is right and confirmed by God’s word, whatever is pure and wholesome, whatever is lovely and brings peace, whatever is admirable and of good repute; if there is any excellence, if there is anything worthy of praise, think continually on these things [center your mind on them, and implant them in your heart].
Father, as we take every thought captive to the glory of Jesus Christ, help us to always think on the things Paul listed in the book of Philippians.
Remember to fix your thoughts on things what is true, honorable, right ,pure , lovely ,and admirable, and think about things that are excellent and worthy of PRAISE!!