In faith I do not love thee with mine eyes
For they in thee a thousand errors note;
But 'tis my heart that loves what they despise
Who, in despite of view, is pleased to dote
Nor are mine ears with thy tongue's tune delighted;
Nor tender feeling, to base touches prone
Nor taste, nor smell, desire to be invited
To any sensual feast with thee alone:
But my five wits nor my five senses can
Dissuade one foolish heart from serving thee
Who leaves unswayed the likeness of a man
Thy proud heart's slave and vassal wretch to be:
Only my plague thus far I count my gain
That she that makes me sin awards me pain
This “plague” may  hyperbolically  refer to the speaker’s lovesickness, or  perhaps to the venereal disease  alluded in in other sonnets, especially  Sonnet 144 .
Sonnet 141