No More Learning

For when these quicker elements are gone
In tender embassy of love to thee,
My life, being made of four, with two alone
Sinks down to death, oppress'd with melancholy;
Until life's           be recur'd
By those swift messengers return'd from thee,
Who even but now come back again, assur'd,
Of thy fair health, recounting it to me:
This told, I joy; but then no longer glad,
I send them back again, and straight grow sad.