Yes crater, also known as trolling and forbidden on many forums.
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I think he refers to the fact that Jesus said, "You are clean" before the disciples forsook Him and Peter denied Him. The point is, He knew they would do that.

At the words, "If I wash thee not, thou hast no part with Me," Peter surrendered his pride and self-will. He could not endure the thought of separation from Christ; that would have been death to him. "Not my feet only," he said, "but also my hands and my head. Jesus saith to him, He that is washed needeth not save to wash his feet, but is clean every whit." {DA 646.2}

These words mean more than bodily cleanliness. Christ is still speaking of the higher cleansing as illustrated by the lower. He who came from the bath was clean, but the sandaled feet soon became dusty, and again needed to be washed. So Peter and his brethren had been washed in the great fountain opened for sin and uncleanness. Christ acknowledged them as His. But temptation had led them into evil, and they still needed His cleansing grace. When Jesus girded Himself with a towel to wash the dust from their feet, He desired by that very act to wash the alienation, jealousy, and pride from their hearts. This was of far more consequence than the washing of their dusty feet. With the spirit they then had, not one of them was prepared for communion with Christ. Until brought into a state of humility and love, they were not prepared to partake of the paschal supper, or to share in the memorial service which Christ was about to institute. Their hearts must be cleansed. Pride and self-seeking create dissension and hatred, but all this Jesus washed away in washing their feet. A change of feeling was brought about. Looking upon them, Jesus could say, "Ye are clean." Now there was union of heart, love for one another. They had become humble and teachable. Except Judas, each was ready to concede to another the highest place. Now with subdued and grateful hearts they could receive Christ's words. {DA 646.3}

Like Peter and his brethren, we too have been washed in the blood of Christ, yet often through contact with evil the heart's purity is soiled. We must come to Christ for His cleansing grace. Peter shrank from bringing his soiled feet in contact with the hands of his Lord and Master; but how often we bring our sinful, polluted hearts in contact with the heart of Christ! How grievous to Him is our evil temper, our vanity and pride! Yet all our infirmity and defilement we must bring to Him. He alone can wash us clean. We are not prepared for communion with Him unless cleansed by His efficacy. {DA 646.4}

Jesus said to the disciples, "Ye are clean, but not all." He had washed the feet of Judas, but the heart had not been yielded to Him. It was not purified. Judas had not submitted himself to Christ. {DA 649.1}

The question is - How can it be said people are in Christ while they are in the throes of known sin?