What is the tone of Shakespeare's Sonnet 14?Who is speaking? What is the speaker's tone? What evidence do you have that this is the tone?

The tone in Shakespeare's Sonnet 14 is one of loving
reverence. The speaker tells us that he has studied astronomy and can understand the
stars in their physical sense, but he cannot read them as an astrologer would. He
cannot 

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...tell of good or evil luck,
Of
plagues, of dearths, or seasons' quality;
Nor can I fortune to brief minutes
tell,
Pointing to each his thunder, rain and
wind.

After admitting this to
his subject, the speaker says that he can read the stars in
her eyes:

But
from thine eyes my knowledge I derive,
And, constant stars, in them I read
such art
As truth and beauty shall together
thrive.

Here is where
he illustrates his reverence. Having studied the stars, he reveres her, because he
sees "truth and beauty" in her eyes and not where he really should see it - in the
stars.

In the last three lines the speaker adds a sense of
love to his words. He says:

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If from thyself to store thou wouldst convert;

Or else of thee this I prognosticate:
Thy end is truth's and
beauty's doom and date.

He's
saying that her "end" would be the end of truth and beauty. If she does not live on,
through children, truth and beauty will die with her. These are the very loving words
that add to the reverence of the opening lines.