“He who has an ear, let him hear what the Spirit says to the churches. He who overcomes shall not be hurt by the second death.”- Revelation 2:11
“He who has an ear, let him hear what the Spirit says to the churches. To him who overcomes I will give some of the hidden manna to eat. And I will give him a white stone, and on the stone a new name written which no one knows except him who receives it.” - Revelation 2:17
"And he who overcomes, and keeps My works until the end, to him I will give power over the nations— Revelation 2:26
"He who overcomes shall be clothed in white garments, and I will not blot out his name from the Book of Life; but I will confess his name before My Father and before His angels. - Revelation 3:5
"He who overcomes, I will make him a pillar in the temple of My God, and he shall go out no more. I will write on him the name of My God and the name of the city of My God, the New Jerusalem, which comes down out of heaven from My God. And I will write on him My new name. - Revelation 3:12
"To him who overcomes I will grant to sit with Me on My throne, as I also overcame and sat down with My Father on His throne. - Revelation 3:21
In each case, Christ is referencing the need to overcome sins (which He names) in order to achieve the Reward He wants for us.
"...Be not afraid, only believe." (Mark 5:36)
"Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent." (John 6:29)