'Oh how doth Satan labour with might and main to work men to make false definitions of faith! Some he works to define faith too high, as that it is a full assurance of the love of God to a man's soul in particular, or a full persuasion of the pardon and remission of a man's own sin in particular. Saith Satan, What dost thou talk of faith? Faith is an assurance of the love of God, and of the pardon of sin; and this thou hast not; thou knowest thou art far off from this; therefore thou hast no faith. And by drawing men to make such a false definition of faith, he keeps them in a sad, doubting, and questioning condition, and makes them spend their days in sorrow and sighing, so that tears are their drink, and sorrow is their meat, and sighing is their work all the day long.'
Thomas Brooks, Precious Remedies Against Satan's Devices, p.148.