Augustine of Hippo
Catena Aurea · Johannesevangelium 16
His disciples said unto him, Lo, now speakest thou plainly, and speakest no proverb. Now are we sure that thou knowest all things, and needest not that any man should ask thee: by this we believe that thou camest forth from God. Jesus answered them, Do ye now believe? Behold, the hour cometh, yea, is now come, that ye shall be scattered, every man to his own, and shall leave me alone: and yet I am not alone, because the Father is with me. These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.
When the Holy Spirit was given them, they were of good cheer, and, in His strength, victorious. For He would not have overcome the world, had the world overcome His members. When He says, These things have I spoken to you, that in Me ye might have peace, He refers not only to what He has just said, but to what He had said all along, either from the time that He first had disciples, or since the supper, when He began this long and wonderful discourse. He declares this to be the object of His whole discourse, viz. that in Him they might have peace. And this peace shall have no end, but is itself the end of every pious action and intention.