How we cite our quotes: (Act.Scene.Line). Line numbers correspond to the Norton Shakespeare edition.
Quote #4
SHYLOCK
Why, thou
loss upon loss! The thief gone with so much, and so
much to find the thief, and no satisfaction, no
revenge, nor no ill luck stirring but what lights a' my
shoulders, no sighs but a' my breathing; no tears but
a' my shedding. (3.1.91-96)
Shylock is genuinely despairing here. It seems the fact that he has no recourse, vengeance, or justice is as upsetting to him as the fact that his daughter has stolen from him and run away. The only justice he can seek is against Antonio—even though Antonio had nothing to do with this particular affair. It's clear from this moment on that Shylock will pursue the law tooth and nail. His frustration with Antonio will combine with his frustration at having no love and no advocate.
Quote #5
TUBAL
There came divers of Antonio's creditors in my
company to Venice that swear he cannot choose
but break.
SHYLOCK
I am very glad of it. I'll plague him, I'll
torture him. I am glad of it.
TUBAL
One of them showed me a ring that he had of
your daughter for a monkey.
SHYLOCK
Out upon her! Thou torturest me, Tubal. It
was my turquoise! I had it of Leah when I was a
bachelor. I would not have given it for a wilderness
of monkeys.
TUBAL
But Antonio is certainly undone.
SHYLOCK
Nay, that's true, that's very true. Go, Tubal,
fee me an officer. Bespeak him a fortnight before. I
will have the heart of him if he forfeit, for were he
out of Venice I can make what merchandise I will. (3.1.112-127)
Tubal delivers news of Antonio's failed ventures and Jessica's betrayals. Reasonably, Shylock's reactions to these two threads of news mix, and he clearly decides he'll take his vengeance out on Antonio. His rousing speech earlier to Salerio and Solanio suggested he was ready to take vengeance against Antonio, but if there's a moment that he really decides he's going to go after his pound of flesh, this is it. It's also poignant that what drives him over the edge is the fact that Jessica pawned her mother's turquoise ring. If she can sell even that, it seems, then nothing is worth anything, not money, family, or love. Shylock can't be bothered to grieve sentimentally, as he was never that kind of guy anyway, but justice is the only thing that can deliver him any kind of satisfaction now, as everything else has been rendered worthless.
Quote #6
BASSANIO
In law, what plea so tainted and corrupt
But, being seasoned with a gracious voice,
Obscures the show of evil? (3.2.77-79)
Bassanio shows a great deal of wisdom here, reasoning that ornamentation can be deceiving. Anyone with a sweet voice can manipulate the law and disguise his true intent. This is particularly prescient, as Portia's eloquence will convince the court to impose a merciless sentence on Shylock and leave her looking like the picture of justice. Portia herself points out that justice can be contrary to the greater good of mercy.