The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds...that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ.
— 2 Corinthians 10:4,5, NIV
It is the special work of Satan in these last days to take possession of the minds of youth, to corrupt their thoughts, and inflame their passions, knowing that by thus doing he can lead them to moral pollution... Their meditations should be of that nature which will elevate their minds, and make Jesus and heaven the subjects of their thoughts.
When tempted to yield to a corrupt imagination, then flee to the throne of grace and pray for strength from Heaven. In the strength of God the imagination can be restricted to dwell upon things which are pure and heavenly.
Those who would have that wisdom which is from God, must become fools in the sinful knowledge of this age, in order to be wise. They should shut their eyes that they may see and learn no evil. They should close their ears lest they hear that which is evil, and obtain that knowledge which would stain their purity of thoughts and acts.
All have power to control their actions, if they will. If they are weak in virtue and purity of thoughts, and acts, they can obtain help from the Friend of the helpless. Jesus is acquainted with all the weaknesses of human nature, and if entreated, will give strength to overcome the most powerful temptations. All can obtain this strength if they seek for it in humility.
The prayer of the living Christian will be “to be filled with the knowledge of His will, in all wisdom, and spiritual understanding, that they may walk worthy of the Lord unto all pleasing, being fruitful in every good work, and increasing in the knowledge of God, strengthened with all might, according to his glorious power, unto all patience and long-suffering, with joyfulness.” “In whom are hid all the treasures of wisdom and knowledge.”
Here is the true knowledge which should be desired, and possessed by every Christian. This knowledge will not lead to ungodliness...but will impart substantial joys, and true happiness.
— An Appeal to Mothers, p.29-32
The thoughts should be on those things that elevate the mind. Make Jesus and heaven the subject of your thoughts.
When tempted to yield to a corrupt imagination, flee to the throne of grace and pray for strength from Heaven.
Shut the eyes to see no evil, obtain no knowledge that stains the purity of thoughts and acts.
Pray to be filled with the knowledge of His will and to give you wisdom to walk worthy of the Lord. Ask to be strengthened with His glorious power to give you all patience and endurance.