First of all, I feel that it is a weak argument to claim that direct revelation plus Scripture was necessary SOLELY because the canon was incomplete, since even a completed canon would give no military guidance to a commander today, in the sense in which David was extra-Scripturally guided. Could a modern general look at the Bible and deduce from it what military stratagem to employ against his foes e.g. a head-on assault or a flanking manouevre? No! So what bearing did an incomplete canon have on God's special guidance of David in that battle? Surely the answer is none whatsoever. Therefore it is a bogus argument to say that direct revelation is no longer necessary for every situation because we have a completed Bible. It would be better to link cessationism with the close of the foundational period of prophets and apostles than to base it on the weak argument I have just (I hope) proven amiss.
Could you provide a scriptural passage that claims God will provide special revelation outside His word after it's completion? Is there a passage that requires God to provide special revelation for every event?
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I am not doubting the completion of the canon of Scripture; actually, I wholly accept its completion. And yes, if David's example was recorded in Scripture then it goes without saying that it should have been recorded. What I am trying to do is determine whether or not there are still instances of genuine special revelation from God in matters unrelated to practical godliness or salvation, i.e., as was the case with David's military guidance.
The reference isn't special revelation. It is canonized scripture. David was the God appointed King of Israel; something nobody claims today. Historically, the Church has held that all that is necessary for salvation is revealed in God's Word.
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The Westminster Confession of Faith, Chapter I Of the Holy Scripture
I. Although the light of nature, and the works of creation and providence do so far manifest the goodness, wisdom, and power of God, as to leave men unexcusable;[1] yet are they not sufficient to give that knowledge of God, and of his will, which is necessary unto salvation.[2] Therefore it pleased the Lord, at sundry times, and in divers manners, to reveal himself, and to declare that his will unto his church;[3] and afterwards, for the better preserving and propagating of the truth, and for the more sure establishment and comfort of the church against the corruption of the flesh, and the malice of Satan and of the world, to commit the same wholly unto writing:[4] which maketh the Holy Scripture to be most necessary;[5] those former ways of God's revealing his will unto his people being now ceased.[6]
1. Rom. 1:19-20; 1:32-2:1; 2:14-15; Psa. 19:1-4 2. John 17:3; I Cor. 1:21; 2:13-14 3. Heb. 1:1-2 4. Luke 1:3-4; Rom. 15:4; Matt. 4:4, 7, 10; Isa. 8:20 5. II Tim. 3:15; II Peter 1:19 6. John 20:31; I Cor. 10:11; 14:37; I John 5:13; Heb. 1:1-2; 2:2-4
The Thirty-nine Articles of Religion, Article VI Of the Sufficiency of the Holy Scriptures for Salvation
Holy Scripture containeth all things necessary to salvation: so that whatsoever is not read therein, nor may be proved thereby, is not to be required of any man, that it should be believed as an article of the Faith, or be thought requisite or necessary to salvation.
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Through a bizarre succession of events, I have felt utterly convinced before God that a certain outcome to a friendship with a girl was assured; however, after an innumerable host of susbequent "false dawns", no tangible progress has yet occurred. Doubting the erstwhile assurance, I began a friendship with someone else and it is coming close to a time when an irreversible decision must be made. Sadly, I have felt now, more than ever, when praying to God, that the first girl was certainly promised... This places me in a serious dilemma and has caused me to completely reassess my long-held view that cessationism was 100% correct.
Personal experience does not dictate universal truth.