"It is the Spirit who gives life; the flesh is no help at all" -John 6:63
"no one can say 'Jesus is Lord' except by the Holy Spirit" - 1 Cor 12:3
"This is why I told you that no one can come to me unless it is granted him by the Father." John 6:65, and All that the Father gives me will come to me, and whoever comes to me I will never cast out. - John 6:37
"no one comprehends the thoughts of God except the Spirit of God. Now we have received not the spirit of the world, but the Spirit who is from God, THAT WE MIGHT UNDERSTAND the things freely given us by God...The natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned."
Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit. For the promise is for you and for your children and for all who are far off, everyone whom the Lord our God calls to himself.” Acts 2:38-39
He went on to say, “This is why I told you that no one can come to me unless the Father has enabled them.” -John 6:65.
The spiritually dead man does not understand spiritual matters. This plain from scripture so he will not come to faith unless He has spiritual life, a renewed heart, his eyes opened.. then he can receive this by faith. The father enables men to come.. Men don't enable themselves.