Sonnet 77

Thy glass will show thee how thy beauties wear,
thy dial how thy precious minutes waste,
the vacant leaves thy mind’s imprint will bear,
and of this look this learning mayst thou taste:
the wrinkles which thy glass will truly show
of mouthèd graves will give thee memory;
thoy by thy dial’s shady stealth mayst know
time’s thievish progress to eternity.
Look what thy memory cannot contain
commit to these waste blanks, and thou shalt find
those children nursed, delivered from thy brain,
to take a new acquaintance of thy mind.
These offices, so oft as thou wilt look,
shall profit thee, and much enrich thy book.

William Shakespeare