And these 3 are one, in agreement.

John 10:30 I and the Father are one.

John 17:21 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.

“That they all may be one” as we are one

Psalms 133:1 A Song of degrees of David. Behold, how good and how pleasant it is for brethren to dwell together in unity!

“in unity” is what we are to be.