"The concurrent testimony of all the Scriptures, and the corroborative evidence of the signs of the times, formed a fortress of truth of impregnable strength.....suddenly we find suspended over and across the way a banner with this remarkable inscription:- UNTO TWO THOUSAND AND THREE HUNDRED DAYS; THEN SHALL THE SANCTUARY BE CLEANSED. Daniel 8:14.
Raising the inquiry, why and by whom these words were spoken, we 
find they were called out by a conversation between two of the angels of God. And the question raised by one was answered by the other, not to the speaker, but to the prophet Daniel.
The question was, "How long shall be the vision concerning the
daily sacrifice and the transgression of desolation, to give both the sanctuary and the host to be trodden under foot?"
daily sacrifice and the transgression of desolation, to give both the sanctuary and the host to be trodden under foot?"
And in answer, the angel turning to Daniel said, "Unto two thousand and three hundred days; then shall the sanctuary be cleansed."
The question is one which is calculated to enlist our whole attention." Uriah Smith