Upon the hours, and times of your desire?
I have no precious time at all to spend;
Nor services to do, till you require.
Nor dare I chide the world without end hour,
Whilst I, my sovereign, watch the clock for you,
Nor think the bitterness of absence sour,
When you have bid your servant once adieu;
Nor dare I question with my jealous thought
Where you may be, or your affairs suppose,
But, like a sad slave, stay and think of nought
Save, where you are, how happy you make those.
So true a fool is love, that in your will,
Though you do anything, he thinks no ill.
The couplet resolves what has gone before, the repeated “nor"s. Shakespeare tells the Fair Youth that love has made him a fool.  Nothing the boy can do will damage his unwavering opinion of him.
Sonnet 57