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 non-essential to preserve the essential. I learnt how to obtain the best I could, when I could not obtain everything; instead of being indignant or dispirited because I could not have entirely my own way, to be pleased and encouraged when I could have the smallest part of it; and when even that could not be, to bear with complete equanimity the being overruled altogether. I have found, through life, these acquisitions to be of the greatest possible importance for personal happiness, and they are also a very necessary condition for enabling any one, either as theorist or as practical man, to effect the greatest amount of good compatible with his opportunities.