For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness. Men are what their thoughts make them. As he thinketh in his heart, so is he. Our thoughts will reward or condemn us before the judgment bar. The righteous and the wicked are divided by their thoughts, and the secret thoughts of men will be revealed in the judgment.
Righteous thoughts lead to salvation, wicked thoughts to damnation.
Part of man's mortal probation is to see if he can control his thoughts in accordance with righteous principles. Thoughts are idle if they do not work to further man's peace in this life and eternal reward in the next. To be saved men must repent of their evil thoughts. Men should think on the things of righteousness. They should meditate upon the great truths which the Lord has revealed.