If we were following a man undoubtedly it would be
different with us; undoubtedly one human idea
would contradict another and that which was light
one or two or six years ago would be regarded as
darkness now: But with God there is no
variableness, neither shadow of turning, and so it is
with truth; any knowledge or light coming from
God must be like its author. A new view of truth
never can contradict a former truth. "New light"
never extinguishes older "light," but adds to it. If
you were lighting up a building containing seven
gas jets you would not extinguish one every time
you lighted another, but would add one light to
another and they would be in harmony and thus give
increase of light: So is it with the light of truth; the
true increase is by adding to, not by substituting one
for another.
(Zion's Watch Tower February 1881 WTR p. 188)
What a quote.
Thank you.