Sentence:  Eventually it became clear to me , partly with the aid of another schizophrenic patient who could point out my condescension to me somewhat more directly , that this man , with his condescending , `` You 're welcome '' , was very accurately personifying an element of obnoxious condescension which had been present in my own demeanor , over these months , on each of these <WSD>occasions</WSD> when I had bid him good-bye with the consoling note , each time , that the healing Christ would be stooping to dispense this succor to the poor suffered again on the morrow . 
Meaning of the word marked with <WSD> tags:  an event that occurs at a critical time