Strong feelings that Antonio shows in the novel and quotations and page references

ANTONIO

I pray you, good Bassanio, let me know it;

And if it stand, as you yourself still do,

Within the eye of honour, be assur'd

My purse, my person, my extremest means,

Lie all unlock'd to your occasions. (1.1.8)

Antonio is willing to do anything to help his friend, including loaning him the money to woo Portia. What's interesting is that Antonio says that it's not just his "purse" (wallet) that's "unlock'd" for Bassanio's use; he is also making his entire "person" available to his friend, which may suggest a sexual relationship.