I hate him for he is a Christian;
But more for that in low simplicity
He lends out money gratis, and brings down
The rate of usance here with us in Venice.
(I, iii)

In the first act, one aspect of Shylock's nature is clearly revealed. Here he complains that Antonio, by lending out money for free, brings down the interest rate at which he can lend money. Shylock's greed is apparent throughout the play, and statements like these help draw a caricature of what Shakspeare's audience would recognize as the stereotypical, selfish, medieval Jew.

Signior Antonio, many a time and oft
In the Rialto you have rated me
About my moneys and my usances;
Still have I borne it with a patient shrug,
For suff'rance is the badge of all our tribe;
(II, vii)

Here Shylock responds to Bassiano's request for money, pointing out that he is not deaf to all of the criticism he has endured; rather, that he turns a blind eye to it. Shylock makes a good point in this conversation with Bassiano: despite their obvious hatred for him, they come to him for help in the form of money.

'All that glisters is not gold,
Often have you heard that told;
Many a man his life hath sold
But my outside to behold:
Gilded tombs do worms infold
(II, vii)

The Price of Morocco finds this note written on a scroll when he opens the golden chest. He mistakenly equates Portia with material value, and thus the chest serves as another example of Christian values that run deeper than surface appearance. Indeed, the quote suggests that the pursuit of "gold" often leads men to their tombs.

Therefore, thou gaudy gold,
Hard food for Midas, I will none of thee;
Nor none of thee, thou pale and...