I wrote this in "Trinity Mystery Solved' {placed in bible debate}
I thought I should mention it here because it pertains to the Holy Spirit.
As regarding the "oneness" of Heavenly Father, His Son , Jesus Christ and the Holy Spirit,
this oneness is described in Philippians 2:2 {in bible}
"that ye being like minded, having the same love, being of one accord, of one mind.
They are one on heart {their desires} and thought {their knowledge}.
Heavenly Father,:bounce Jesus Christ {His Son},:bounce and the Holy Spirit :bounce
are one in agreement
2 Corinthians 13:11 {in bible}
"finally brethren,...be perfect, be of good comfort, be of one mind, live in peace and the God of love and peace shall be with you."
One reason to believe that this oneness is the same as that of the Father and Son is this...
John 17:11,21 {in bible} Jesus Intercessory Prayer
"...Holy Father, keep through thine own name those whom thou hast given me, that they may be one as we are."
"That they all may be one, as thou, Father, art in me and I in thee, that they also may be one in us that the world may believe that thou hast sent me."
Here Jesus is praying to the Father, not to himself.
Acts 4:32 {in bible} is an example of what Jesus is saying to His Father.
"and the multitude of them that believed were of one heart and of one soul."
{They desired and believed the same.}
Philippians 1:27 {in bible}
"...stand fast in one spirit, with one mind, striving together for the faith of the gospel."
John 15:4-10 {in bible} I call it Jesus Valentine to us
"Abide in me and I in you. As the branch can not bear fruit of itself except it abide in the vine, nor more can you, except ye abide in me. I am the vine, ye are the branches. He that abideth in me and I in him, the same bringeth forth much fruit, for without me ye can do nothing. If ye abide in me and my words abide in you, ye shall ask what ye will and it shall be done unto you. As the Father hath loved me, so have I loved you, continue ye in my love. If ye keep my commandments, ye shall abide in my love, even as I have kept my Father's commandments and abide in His love."
Jesus kept His Father's {the God of Abraham, Isaac and Jacob's} commandments.