Analysis of Tears, flow no more

TEARS, flow no more, or if you needs must flow,
           Fall yet more slow,
       Do not the world invade,
From smaller springs than yours rivers have grown,
       And they again a Sea have made,
Brackish like you, and which like you hath flown.

Ebb to my heart, and on the burning fires
           Of my desires,
       O let your torrents fall,
From smaller heate than theirs such sparks arise
       As into flame converting all,
This world might be but my love's sacrifice.

Yet if the tempests of my sighs so blow
           You both must flow,
       And my desires still burn,
Since that in vain all help my love requires,
   Why may not yet their rages turn
To dry those tears, and to blow out those fires ?