"How are we to adjudicate among rival ontologies? Certainly the answer is not provided by the semantical formula "To be is to be the value of a variable"; this formula serves rather, conversely, in testing the conformity of a given remark or doctrine to a prior ontological standard."

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Some men -- not all men -- see always before them an ideal, a mental picture if you will, of what they ought to be, and are not. Whoso seeks to follow this ideal revealed to the mental vision, whoso seeks to attain to conformity with it, will find it enlarge itself, and remove from him. He that follows it will improve his own moral character, but the ideal will remain always above him and before him, prompting him to new exertions.

— William Batchelder Greene