Indeed, He was "conceived of the Holy Ghost". He inherited his body from His mother but His nature from His Father. In the flesh He was subject to all the weaknesses of the flesh ... yet He was not prey to them since He had not fallen human nature but God's perfect nature. And it was through the trials and temptations that confronted Him that He was able to express His perfect nature and show us how God intended man to be. So, too, it is through the trials and temptations that confront us that we have the opportunity to express the nature of Christ in us. And that expression only comes as we more and more yield to Him, and more and more live in the victory of the Cross (in other words in complete belief in all that Jesus won for us by His sacrifice) through which the Holy Spirit brings to fruition the gospel seed planted in us at salvation.