"Our condition through sin is unnatural, and the power that restores us must be supernatural, else it has no value. There is but one power that can break the hold of evil from the hearts of men, and that is the power of God in Jesus Christ. Only through the blood of the Crucified One is there cleansing from sin. His grace alone can enable us to resist and subdue the tendencies of our fallen nature. The spiritualistic theories concerning God make His grace of no effect. If God is an essence pervading all nature, then He dwells in all men; and in order to attain holiness, man has only to develop the power within him. MH 428.3"
"Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved."
Both passages emphasize that salvation and restoration from sin come only through Jesus Christ and not through any other means. EGW elaborates on the implications of alternative views.
"These theories, followed to their logical conclusion, sweep away the whole Christian economy. They do away with the necessity for the atonement and make man his own savior. These theories regarding God make His word of no effect, and those who accept them are in great danger of being led finally to look upon the whole Bible as a fiction. They may regard virtue as better than vice; but, having shut out God from His rightful position of sovereignty, they place their dependence upon human power, which, without God, is worthless. The unaided human will has no real power to resist and overcome evil. The defenses of the soul are broken down. Man has no barrier against sin. When once the restraints of God's word and His Spirit are rejected, we know not to what depths one may sink. MH 428.4"
"I do not frustrate the grace of God: for if righteousness come by the law, then Christ is dead in vain."
Both passages address the idea that relying on something other than God's grace (law or human power) makes Christ's sacrifice ineffective. EGW expands on the consequences of rejecting God's grace and relying on human power.