When there is no special effort made to resist his power, when indifference prevails in the church and the world, Satan is not concerned; for he is in no danger of losing those whom he is leading captive at his will. But when the attention is called to eternal things, and souls are inquiring, “What must I do to be saved?” he is on the ground, seeking to match his power against the power of Christ and to counteract the influence of the Holy Spirit.
– The Great Controversy, pg. 518