605. To receive from it a mark on their right hand and on their foreheads. This symbolically means that no one is acknowledged as a Protestant Reformed Christian but one who accepts that doctrine in faith and love.

To receive a mark means, symbolically, to be acknowledged as a Protestant Reformed Christian, or to be among those who confess what the doctrine teaches. The mark is an acknowledgement that the person is such a one, and also a confession that he is such. The right hand symbolizes everything in a person relating to the power of his intellect, thus to his faith; for the right hand symbolizes a person's power (no. 457). The forehead symbolizes everything in a person relating to the power of his will, thus to his love; for the forehead symbolizes love (no. 347).

'The first resurrection,' mentioned in Revelation 20:5, 6, does not mean a first resurrection, but the essence and primary part of resurrection, which is salvation and eternal life. There is only one resurrection to life. A second does not happen, and is not mentioned anywhere in the Bible.

(References: Apocalypse Explained 6; Apocalypse Revealed 851; Revelation 20:5-6)