Someone claiming to have lost their faith, never possessed it in the first place. True believers persevere in faith and sanctity not by their good works but by the grace of God. It is impossible that those whom the Father gave to the Son, for whom the Son intentionally laid down his life, whom the Holy Spirit has efficaciously brought to new life and true faith, whom the Spirit has united to Christ, whom God has justified and adopted, whom he will finally save by grace alone, through faith alone, should be lost. Salvation belongs to the Lord.
When
WCF 17.1 says that you can neither totally nor finally fall, it acknowledges the possibility that you may partially and penultimately fall. Similarly we would say that the elect are not totally or finally deceived as to fundamental points of truth necessary for salvation; but that means they can be partially and penultimately deceived and deal with great confusion.
Any decent theologian worth his salt can distinguish between the
act and the
habit of faith. The act of faith may recede beyond your ability to discern it; but the habit is there. So it is true that the elect never lose their faith; it is not true that the faith of the elect is always sensible to them or visible to others. In having doubts or temptations, etc., there's certainly some weakness in the acting of faith; but that doesn't imply its entire destruction.
Perseverance is not a straight line. Sometimes perseverance looks like joyful triumphing over problems. Sometimes perseverance looks like Job: struggling, flailing, uttering words without wisdom, but retaining his integrity and resolving to trust God even though it kills him. Perseverance in faith is not necessarily freedom from confusion, doubts, and wrong ideas, but continuing to trust the Lord (or continually returning to that trust after forgetting!) and seeking to hear His word.
Firstly, I firmly believe that those whom God chose and accepted in Christ He effectually called and sanctified by His Spirit; can neither totally or finally fall away from the state of grace. The believer is eternally saved and shall persevere until the end (Phil. 1:6; 2 Peter 1:10; Rom. 8:28-30; John 10:28-29; 1 John 3:9; 5:18; 1 Peter 1:5, 9).
Secondly, even true believers may have their assurance of faith shaken by several things; it may be diminished or even interrupted; such as negligence in preserving it, by falling into sins which wound the conscience and grieve the Holy Spirit. Also, these things can happen by some sudden or particularly vile temptation, by God's withdrawing the light of His face, or suffering the same things that cause fear to those who walk in darkness having no light (Psa. 31:22; 51:8, 12, 14; 77:1-10; Eph. 4:30-31; Matt. 26:69-72; Luke 22:31-44).
However, the true believer is never totally destitute of the seed of God and the life of faith that in the end their love of Christ and the church having a conscience to their duties by operation of the Holy Spirit will in due time be restored (1 John 3:9; Luke 22:32; Psa. 51:8, 12; 73:15). In the meantime, they are supported to keep them from utter despair (Micah 7:7-9; Jer. 32:40; Isa. 54:7-14; 2 Cor. 4:8-10).
We need to trust God's word, not our fickle feelings, when He says:
"
These things I have written to you who believe in the name of the Son of God, in order that you may know that you have eternal life."
I believe assurance can be gained in our walk of faith from feeding our faith and starving our doubts by not neglecting daily Scripture study, rejoicing in hope, being patient in tribulation, continuing steadfastly in prayer (Romans 12:12), fellowship with other believers, keeping stewardship of the secular and spiritual gifts God has given us, and with regular assembly with others to worship God, receive instruction, access the ordinary means of grace, and be subject to discipline.
For more:
http://theologyonline.com/showthrea...edestination&p=4495390&viewfull=1#post4495390
http://theologyonline.com/showthread.php?101223-Why-shouldn-t-I-convert-from-Evangelical-Protestant-to-Catholic&p=4348822&viewfull=1#post4348822
AMR