Read it through once

In several ways his opinions were totally changed, and would never go back to what they were before, but the main structure of his character was not changed, and could not be changed. One or two very important features of it were altered, and in time effects would result from this, if opportunity offered--effects of a quite serious nature, too. Under the influence of a great mental and moral upheaval his character and habits had taken on the appearance of complete change, but after a while with the subsidence of the storm both began to settle toward their former places. He dropped gradually back into his old frivolous and easy-going ways and conditions of feeling and manner of speech, and no familiar of his could have detected anything in him that differentiated him from the weak and careless Tom of other days.