For he “has put everything under his feet.” Now when it says that “everything” has been put under him, it is clear that this does not include God himself, who put everything under Christ. When he has done this, then the Son himself will be made subject to him who put everything under him, so that God may be all in all. 1 Corinthians 15:27-28 NIV
Some may wonder how the Son will be subject to the Father if they are one. What needs to be understood is that the Father and Son are one in purpose, One in character, One in desire. The Father’s perfect plan was carried out by the Son. The will of the Son was to do the will of the Heavenly Father. Being as they are united in belief and desire, there is no conflict in saying that the Son shall be subject to the Father. All shall be put under Christ’s feet, and since the Son is under the Father, then the Father shall be in all. All shall bend the knee to the Lord. In so doing, they will be acknowledging the Heavenly Father for who He is. I believe too many make the idea of the Holy Trinity too complicated. Remember that God’s ways are not ours, nor His thoughts ours. Should we not accept what God says on faith? Oh, the power we throw away through lack of faith the size of a mustard seed.