13. Note the apostle's peculiar words. He enjoins purging out the old leaven, assigning as reason the fact: Ye are a new and unleavened lump. By a new unleavened lump he means that faith which clings to Christ and believes in the forgiveness of sin through him; for he immediately speaks of our Passover: Christ, sacrificed for us. By this faith the Corinthians are now purified from the old leaven, the leaven of sin and an evil conscience, and have entered upon the new life; yet they are commanded to purge out the old leaven. 14. Now, how shall we explain the fact that he bids them purge out the old leaven that they may be a new lump, when at the same time he admits them to be unleavened and a new lump? How can these Corinthians be as true, unleavened wafers, or sweet dough, when they have yet to purge out the old leaven? This is an instance of the Pauline and apostolic way of speaking concerning Christians and the kingdom of Christ; it shows us what the condition really is. It is a discipline wherein a new, Christian life is entered upon through faith in Christ the true Passover; hence, Easter is celebrated with sweet, unleavened bread. But at the same time something of the old life remains, which must be swept out, or purged away. However, this latter is not imputed, because faith and Christ are there, constantly toiling and striving to thoroughly purge out whatever uncleanness remains. 15. Through faith we have Christ and his purity perfectly conferred upon ourselves, and we are thus regarded pure; yet in our own personal nature we are not immediately made wholly pure, without sin or weakness. Much of the old leaven still remains, but it will be forgiven, not be imputed to us, if only we continue in faith and are occupied with purging out that remaining impurity. This is Christ's thought when he says to his disciples (Jn 15, 3), "Already ye are clean because of the word which I have spoken unto you," and in the same connection he declares that the branches in him must be purged that they may bring forth more fruit. And to Peter--and to others--he says (Jn 13, 10), "He that is bathed needeth not save to wash his feet, but is clean every whit: and ye are clean, but not all." These passages, as is also stated elsewhere, teach that a Christian by faith lays hold upon the purity of Christ, for which reason he is also regarded pure and begins to make progress in purity; for faith brings the Holy Spirit, who works in man, enabling him to withstand and to subdue sin.