It is quite otherwise with regard to the more extraordinary and important objects of self-interest. A person appears mean-spirited, who does not pursue these with some degree of earnestness for their own sake.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“In this consists the difference between the character of a miser and that of a person of exact economy and assiduity. The one is anxious about small matters for their own sake; the other attends to them only in consequence of the scheme of life which he has laid down to himself.
It is quite otherwise with regard to the more extraordinary and important objects of self-interest. A person appears mean-spirited, who does not pursue these with some degree of earnestness for their own sake. We should despise a prince who was not anxious about conquering or defending a province. We should have little respect for a private gentleman who did not exert himself to gain an estate, or even a considerable office, when he could acquire them without either meanness or injustice.” source