The same power that raised Jesus Christ from the grave is necessary to enable a sinner to believe (Eph. 1:19-20). In theological terms, the order of salvation, the ordus salutis, is birth first, belief second: "Whosever believeth that Jesus is the Christ is born of God…" (I Jno. 5:1); "Whosoever heareth my words and believeth on Him that sent me hath everlasting life, and shall not come into condemnation, but is passed from death unto life" (Jno. 5:24). The verb tenses in both of these verses suggest that the individual who presently believes already possesses spiritual life. Notice that the writer does not say "whosoever believes will be born of God." He says the believer is born of God. His belief is the evidence of his new birth. Jesus does not say that the man who hears and believes will get everlasting life, but that he already has it - "he is passed from death unto life." His belief is the evidence of his spiritual resurrection.
The sinner who is dead in trespasses and in sins is spiritually incapacitated, unable to function in the spiritual realm. It is not that the unregenerate merely will not believe. He cannot believe. It is not merely that he refuses to respond. He doesn't have the ability to respond to the gospel call. Jesus asked, "Why do ye not understand my speech? even because you cannot hear my word...He that is of God heareth God's words: ye therefore hear them not, because ye are not of God" (Jno. 8:43,47). This verse declares that an individual who has not experienced a change of nature is utterly incapable of a believing response to the gospel. Ephesians 2:1 describes man by nature as "dead in trespasses and in sins." The image of death suggests that the unregenerate man, like a dead corpse, is unresponsive to stimuli. Is the gospel a kind of external stimuli? Isn't it an appeal to man's mind? Until the sinner is given new life, consequently he will remain unresponsive to the gospel. I Corinthians 1:18 says, "For the preaching of the cross is to them that perish foolishness, but unto us which are saved, it is the power of God." Again, this verse presents a contrast between two types of people, "them that perish," or the unregenerate, and "us which are saved," or the regenerate. According to this verse, what effect does the gospel have on the unregenerate? Is it "the power of God unto salvation"