It should be remembered that the whole idea of The Exercise has been taken out of Paul's original context. Paul's intent was to be bring order out of confusion among those among the Corinthians who were speaking in tongues in the worship service, by having one person at a time speak, with others, after the speaker finished, interpreting.
So, I guess, one could say that The Exercise is not a biblical idea, but an extrapolation from a biblical principle regarding tongues.
Or am I just being pedantic?