There be two sorts of people always in the visible church, one that Satan keeps under with false peace, whose life is nothing but a diversion to present contentments, and a running away from God and their own hearts, which they know can speak no good unto them; these speak peace to themselves, but God speaks none. Such have nothing to do with this Scripture, Ps xlii 11; the way for these men to enjoy comfort, is to be soundly troubled. True peace arises from knowing the worst first, and then our freedom from it. It is a miserable peace that riseth from ignorance of evil. The angel 'troubled the waters,' John v. 4, and then it cured those that stepped in. It is Christ's manner to trouble our souls first, and then to come with healing in his wings.
But there is another sort of people, who being drawn out of Satan's kingdom and within the covenant of grace, whom Satan labours to unsettle and disquiet: being the 'god of this world,' 2 Cor. iv. 4, he is vexed to see men in the world, walk above the world. Since he cannot hinder their estate, he will trouble their peace, and damp their spirits, and cut asunder the sinews of all their endeavours. These should take themselves to task as David doth here, and labour to maintain their portion and the glory of a Christian profession.
Richard Sibbes, Vol 1, p 127 | The Soul's Conflict With Itself