witness
verb (used with object)
to see, hear, or know by personal presence and perception.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
A perfectly sane person, therefore, is subject, object, and witnesser all in one.
From What and Where is God? A Human Answer to the Deep Religious Cry of the Modern Soul by Richard la Rue Swain