Relative pronouns agree with their antecedents, in _gender_, _person_,
and _number_; as, "Thou _who lovest_ wisdom;" "I _who speak_ from
experience."
NOTE. When a relative pronoun is preceded by two antecedents of
different persons, the relative and the verb may agree in person
with either, but not without regard to the sense; as, "I am the man
_who command_ you;" or, "I am the man _who commands_ you." The
meaning of the first of these examples will more obviously appear,
if we render it thus: "I who command you, am the _man_."
When the agreement of the relative has been fixed with either of the
preceding antecedents, it must be preserved throughout the sentence;
as, "I am the _Lord, that maketh_ all things; _that stretcheth_
forth the heavens alone; _that spreadeth_ abroad the earth by
myself," &c.