For the mystery of lawlessness already works. Only there is one who restrains now, until he is taken out of the way.
until he be taken out of the way: Thayer says "to be taken out of the way, to disappear" (402-1-3319). The New International Version translates, "For the secret power of lawlessness is already at work: but the one who now holds it back will continue to do so till he is taken out of the way."