The Holy Spirit
The Holy Spirit brings into fruition what the Father commands and the Son Jesus carries out. John 16:14 says, "He [Holy Spirit] will glorify Me, for He will take of what is Mine and declare it to you. All things that the Father has are Mine. Therefore, I said that He will take of Mine and declare it to you."
The manifestation of the Spirit will be seen in our lives when we're filled with Him. A holy life combined with the fruit of the Spirit and gifts of the Spirit will substantiate that He lives inside us.