“For the grace of God that brings salvation has appeared to all men, teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly in the present age” (Tit. 2: 11,12)
Everyone is exhorted to think soberly, because God has dealt to every person the measure of faith. Many people have a notion that they are so constituted that it is impossible for them to believe. That is a grave error. Faith is just as easy, and just as natural, as breathing. It is the common inheritance of all people, and the one thing wherein all are equal. It is as natural for the child of the infidel to believe as it is for the child of the saint. It is only when people build up a barrier of pride about themselves (Ps. 73:6) that they find it difficult to believe. And even then they will believe; for when people disbelieve God, they believe Satan. When they disbelieve the truth, they greedily swallow the most flagrant falsehoods.
We have seen that faith is given to everyone (Rom. 12:3). This may be known also by the fact that salvation is offered to everyone, and placed within his grasp, and salvation is only by faith. If God had not given faith to everyone, he could not have brought salvation within the reach of all.
The question is, in what measure has God given each one faith? This is really answered in the fact already learned, that the faith which He gives is the faith of Jesus. The faith of Jesus is given in the gift of Jesus Himself, and Christ is given in His fulness to each one. He tasted death for everyone (Heb. 2:9). “To each one of us grace was given according to the measure of Christ’s gift (Eph. 4:7). Christ is not divided; therefore to every person is given all of Christ and all of His faith. There is but one measure.
Waggoner, Waggoner on Romans, p. 179