I am not sure I get this play.
There is a tension as Shylock is asked to place mercy above justice, just so they condemn him, without mercy.
“Duke of
Venice:
How shalt
thou hope for mercy, rendering none?
Shylock:
What
judgement shall I dread, doing no wrong?
You have
among you many a purchased slave,
Which like
your asses and your dogs and mules.
You use in
abject and in slavish parts.
Because you
bought them: - shall I say to you,
Let them be
free, marry them to your heirs?” (Shakespeare, 1994, p.407).
“Portia:
The quality
of mercy is not strain’d –
It droppeth
as the gentle rain from heaven
Upon the
place beneath: it is twice blest, -
It blesseth
him that gives , and him that takes:
(…)
That in the
course of justice, none of us
Should see
salvation: we do pray for mercy;
And that
same prayer doth teach us all to render
The deeds
of mercy.” (Shakespeare, 1994, p.409).