To be a friend of this world is to be a friend of the prince of this world, the devil, aka Satan. “For the wisdom of this world is foolishness with God” (1 Corinthians 3:19).
Let us be reminded of these words spoken to his disciples by our Lord, Savior and King Jesus saying: “The world cannot hate you; but me it hateth, because I testify of it, that the works thereof are evil” (John 7:7).
“If the world hate you, ye know that it hated me before it hated you. If ye were of the world, the world would love his own: but because ye are not of the world, but I have chosen you out of the world, therefore the world hateth you” (John 15:18-19). “He that hateth me hateth my Father also” (John 15:23).
“These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world” (John 16:33).