Will believers, especially the elect, heed this warning?

Rev 13:1-18 LSV 1 And I stood on the sand of the sea, and I saw a beast coming up out of the sea, having seven heads and ten horns, and ten crowns on its horns, and on its heads names of slander, 2 and the beast that I saw was like to a leopard, and its feet as of a bear, and its mouth as the mouth of a lion, and the dragon gave to it his power, and his throne, and great authority. 3 And I saw one of its heads as slain to death, and its deadly wound was healed, and all the earth wondered after the beast, 4 and they worshiped the dragon who gave authority to the beast, and they worshiped the beast, saying, “Who is like to the beast? Who is able to war with it?” 5 And there was given to it a mouth speaking great things, and slanders, and there was given to it authority to make war forty-two months, 6 and it opened its mouth for slander toward God, to slander His Name, and of His dwelling place, and of those who dwell in Heaven, 7 and there was given to it to make war with the holy ones, and to overcome them, and there was given to it authority over every tribe, and tongue, and nation. 8 And all who are dwelling on the earth will worship him, whose names have not been written in the Scroll of Life of the Lamb slain from the foundation of the world; 9 if anyone has an ear—let him hear: 10 if anyone goes into captivity, into captivity he goes; if anyone is to be killed with sword, it is necessary of him by sword to be killed; here is the endurance and the faith of the holy ones. 11 And I saw another beast coming up out of the earth, and it had two horns like a lamb, and it was speaking as a dragon, 12 and all the authority of the first beast does it do before it, and it makes the earth and those dwelling in it that they will worship the first beast, whose deadly wound was healed, 13 and it does great signs, that fire also it may make to come down from the sky to the earth before men, 14 and it leads astray those dwelling on the earth, because of the signs that were given it to do before the beast, saying to those dwelling on the earth to make an image to the beast that has the wound of the sword and lived, 15 and there was given to it to give a spirit to the image of the beast, that also the image of the beast may speak, and it may cause as many as will not worship the image of the beast, that they may be killed. 16 And it makes all, the small, and the great, and the rich, and the poor, and the freemen, and the servants, that it may give to them a mark on their right hand or on their foreheads, 17 and that no one may be able to buy, or to sell, except he who is having the mark, or the name of the beast, or the number of his name. 18 Here is the wisdom! He who is having the understanding, let him count the number of the beast, for it is the number of a man, and its number: six hundred sixty-six.