The analyses of a text #3

The protagonist, Philip, who was born with a club foot, moved in with his uncle Mr. Carey, the Vicar of Blackstable after his mother's death.
He dropped out of King's School at Tercanbury, came to Germany, and got several private teachings.
The following is about his teacher of French Monsieur Ducroz from Geneva.

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Philip looked upon him with puzzled surprise; for he was very unlike his idea of the revolutionary: he spoke in a low voice and was extraordinarily polite; he never sat down till he was asked to; and when on rare occasions he met Philip in the street took off his hat with an elaborate gesture; he never laughed, he never even smiled. A more complete imagination than Philip's might have pictured a youth of splendid hope, for he must have been entering upon manhood in 1848 when kings, remembering their brother of France, went about with an uneasy crick in their necks; and perhaps that passion for liberty which passed through Europe, sweeping before it what of absolutism and tyranny had reared its head during the reaction from the revolution of 1789, filled no breast with a hotter fire. One might fancy him, passionate with theories of human equality and human rights, discussing, arguing, fighting behind barricades in Paris, flying before the Austrian cavalry in Milan, imprisoned here, exiled from there, hoping on and upborne ever with the word which seemed so magical, the word Liberty; till at last, broken with disease and starvation, old, without means to keep body and soul together but such lessons as he could pick up from poor students, he found himself in that little neat town under the heel of a personal tyranny greater than any in Europe. Perhaps his taciturnity hid a contempt for the human race which had abandoned the great dreams of his youth and now wallowed in sluggish ease; or perhaps these thirty years of revolution had taught him that men are unfit for liberty, and he thought that he had spent his life in the pursuit of that which was not worth the finding. Or maybe he was tired out and waited only with indifference for the release of death.
[Of Human Bondage by Somerset Maugham]
1. I'd like to know why it is "no breast," not "breasts."
2. I'd like to know why it is "passionate," not "a zealot."
3. And I'd like to know what "hope on" means.
Thank you in advance for your help.