“A kinder gentleman treads not the earth,”

and he goes on to tell how Antonio, when parting from Bassanio, had “eyes big with tears”:

“Turning his face, he put his hand behind him,
And with affection wondrous sensible
He wrung Bassanio's hand; and so they parted.”

This Antonio is as tender-hearted and loving as young Arthur. And Lorenzo speaks of Antonio to Portia just as Salarino spoke of him:

Lor. But if you knew to whom you show this honour.
How true a gentleman you send relief,
How dear a lover of my lord your husband,
I know you would be prouder of the work
Than customary bounty can enforce you.”

and finally Bassanio sums Antonio up in enthusiastic superlatives:

“The dearest friend to me, the kindest man,
The best-condition'd and unwearied spirit
In doing courtesies, and one in whom
The ancient Roman honour more appears
Than any that draws breath in Italy.”

It is as a prince of friends and most courteous gentleman that Antonio acts his part from the beginning to the end of the play with one notable exception to which I shall return in a moment. It is astonishing to find this sadness, this courtesy, this lavish generosity and contempt of money, this love of love and friendship and affection in any man in early manhood; but these qualities were Shakespeare's from youth to old age.

I say that Antonio was most courteous to all with one notable exception, and that exception was Shylock.

It has become the custom on the English stage for the actor to try to turn Shylock into a hero; but that was assuredly not Shakespeare's intention. True, he makes Shylock appeal to the common humanity of both Jew and Christian.