Rom 12:3 For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith.
1) to be of sound mind
a) to be in one's right mind
b) to exercise self control
1) to put a moderate estimate upon one's self, think of one's self soberly
2) to curb one's passions
A sober mind is a Spirit controlled mind. The hardest thing to control seems to be our words.
The measure of faith
Rom 12:2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
Faith is for the things of God, to do His will. His word in the Bible is His will. Fill your mind and heart with his will and you will be transformed. You also will be changed, and the thoughts and actions of this world will be seen from the light of God's truth. We need light. God is truth and light. Liars are of the darkness. Lord Jesus you took the punishment for evil so that I may live with you in heavenly places. Help me to stay in your will and purpose for my life.