It's a slogan taken from several pages of scripture. Here are some of them:
"...do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.... Abhor what is evil. Cling to what is good." Romans 12:2, 9
"Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. For all that is in the world -- the lust of the flesh, the lust of the eyes, and the pride of life -- is not of the Father but is of the world. And the world is passing away, and the lust of it; but he who does the will of God abides forever." 1 John 2:15-17
"Jesus answered, 'My kingdom is not of this world. If My kingdom were of this world, My servants would fight, so that I should not be delivered to the Jews; but now My kingdom is not from here." John 18:36
"For our citizenship is in heaven, from which we also eagerly wait for the Savior, the Lord Jesus Christ, who will transform our lowly body that it may be conformed to His glorious body...." Philippians 3:20