John Chrysostom
After the Savior liberated the apostles from all forms of anxiety, fear, and concern, and elevated them beyond reproach, He eventually spoke about the confidence they were to possess in proclaiming the message. There was no obscurity when Christ communicated this, nor did He whisper to His disciples; rather, He employed an intensified and focused speech. Addressing them in solitude in a secluded area of Palestine, He conveyed His message—within the shadows and to their ears—aiming to juxtapose the essence of genuine dialogue with the boldness required for their preaching.
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He instructed them not to confine their message to one or two cities but to share it across the entirety of the world, encouraging them to traverse land and sea, through both populated and desolate places, with their heads held high and with great courage, proclaiming all truths to kings and nations, to scholars and orators. Therefore, He stated, "On the blood and in the light," meaning without fear and with total liberty.
But why did He not merely say: preach in the blood, and speak in the light, instead adding, "I speak unto you in darkness," and "You hear in your ears"? This was to uplift their spirits. Just as He expressed elsewhere, "He that believeth in Me, the works that I do, this one also shall do, and greater works than these he shall do" (John 14:12), He included these words here to illustrate that He would achieve all things through them, and that they would do even greater things than He had accomplished. He declared, "I have initiated a plan and a purpose, and through you, I aim to achieve far more." In sharing this, He not only imparts a directive but also prophesies the future with firm assurance of the truth of His declarations, indicating that they would triumph over all obstacles, and He effectively removes from them the fear of slander. Just as this sermon, now seemingly ordinary, will spread far and wide, so too will the negative perceptions held by the Jews soon fade away.