The following is a post from Ron DiGiacomo, expressing some reflections on the recent discussion here on the nature of faith. Is it assent alone, or assent + trust?
It has recently been argued by some that we are justified by belief alone and that receiving and resting in Christ unpacks what it is to believe. In other words, receiving and resting in Christ is considered a figure of speech by which belief in Christ can be defined. Trusting in Christ does not complete justifying belief because trusting is synonymous with believing. Accordingly, to add receiving and resting in Christ to belief is either (i) redundant, (ii) strips belief of part of its meaning, needlessly placing it somewhere else, or (iii) to add something additional to the instrumental cause of justification. The first deviation would be a matter of muddled thinking, but the gospel would remain intact although jumbled. The second would be purely a matter of semantics. Whereas the third construct would undermine the grace by which we are saved, appropriated by belief alone.
Those who promote the belief alone view are sometimes met with tedious rejoinders such as the false dichotomy “we’re saved by Christ not propositional belief.” Notwithstanding, more serious objections have been raised by Teaching and Ruling Elders against the belief alone position because of the group’s insistence upon equating belief with assent. This is where things get a bit dicey. Most of the things we assent to, whether a priori or a posteriori, are not volitional. One does not will to believe that God exists any more than a child chooses to believe he is being fed by his mother. These are mental assents that are not discursive; they are immediate and without reflection. The will is bypassed. However, the gospel always engages the will as the unbeliever counts the cost and by grace abandons all hope in himself while looking to Christ alone, finding rest in Him. Accordingly, it is inadequate to reduce justifying faith to belief alone when belief is reduced to assent without remainder.
It is at this point someone will assert that assent is synonymous with resting in or relying upon Christ. In this context is it is opined that to assent to Christ dying on the cross for my sins is to trust the proposition is true. Albeit the premise is true, this observation turns on a subtle equivocation over the word trust. Indeed, to trust a proposition is true is no different than to assent to its truth. So, in that sense trust and assent are synonyms. However, to trust that something is true is not the same thing as to trust in that something. The latter idea of trust carries the meaning of reliance upon, whereas the former use of trust merely conveys an intellectual assent that might or might not be accompanied by the reliance sort of trust. Accordingly, to argue that trust and assent are synonyms in this way is to implicitly deny the need to willfully trust upon Christ alone for salvation!
As a last ditch effort some have argued that it is impossible to assent to the truth of the gospel without justification following. They draw a distinction between (i) assent in non-spiritual matters (allowing for assent to obtain without trust) and (ii) assent with respect to the gospel (suggesting that assent is inseparable to trust, even its equivalent). They reason that true assent to the gospel is only granted at conversion. Therefore, assent is trust because the two are inseparable where the gospel is concerned. Rather than debate the premise, it’s much easier to concede it for argument’s sake in order to save time in refuting the conclusion that assent is trust. Even if assent were a sufficient condition for pardon in Christ that would not mean that assent equates to trust any more than assent is regeneration. It would merely mean that when assent is present pardon obtains, just like when pardon obtains regeneration is present. Since when may a sufficient condition be equated with the relevant components that comprise the state of affairs within which the condition operates?!
In sum, assent pertains to accepting something as true, even possibly with no reflection, whereas trust (or non-trust) pertains to the degree of relevance a person might assign to the “assented to” proposition. Assent is a mental act that need not be accompanied by volition; whereas trust in Christ is always volitional in nature. Assent always pertains to accepting the truth of a proposition, whereas how one might respond in light of assent (e.g. trust, rest, exuberance, etc.) is commonly classified under the philosophical heading of disposition (which is not propositional assent). Whereas trust and other dispositions can evidence assent, dispositions need not accompany any given assent since assents can be mundane, occur without reflection and, also, be subjectively perceived as inconsequential. (This is why philosophers consider disposition to be a poor indicator of the presence of assent.)
If assent and trust were synonyms under the gospel, then either they both would mean cognitive conviction or else volitional reliance. Conviction of truth (assent) could never give way to reliance upon truth (trust). If assent and trust mean the same thing, then either we cannot rely upon our convictions or else we can only rely upon things that don’t convince us. Conviction without reliance leaves no room for trusting in Christ; whereas reliance without conviction paves the way to trusting in Christ while not assenting to the gospel.