Psmith in the City by P. G. Wodehouse

If one looks closely into those actions which are apparently due to sudden impulse, one generally finds that the sudden impulse was merely the last of a long series of events which led up to the action. Alone, it would not have been powerful enough to effect anything. But, coming after the way has been paved for it, it is irresistible. The hooligan who bonnets a policeman is apparently the victim of a sudden impulse. In reality, however, the bonneting is due to weeks of daily encounters with the constable, at each of which meetings the dislike for his helmet and the idea of smashing it in grow a little larger, till finally they blossom into the deed itself.

This was what happened in Mike's case. Day by day, through the summer, as the City grew hotter and stuffier, his hatred of the bank became more and more the thought that occupied his mind. It only needed a moderately strong temptation to make him break out and take the consequences.