Single: Double

Hear me out,
For I speak with you.
The voice is one,
Why do sounds differ.
Hold me tight,
For I am your support.
The spine is one,
Why do bodies differ.
See with me,
For I am your sole eye.
The view is one,
Why does sight differ.
Cry with me,
For I feel your grief.
The tears are one,
Why does source differ.