"The standard that measures two things is..." - Quote by C S Lewis
The standard that measures two things is something different from either. You are, in fact, comparing them both with some Real Morality, admitting that there is such a thing as a real Right, independent of what people think, and that some people's ideas get nearer to that real Right than others.
More by C S Lewis
“The surest way of spoiling a pleasure [is] to start examining your satisfaction.”
“Things never happen the same way twice.”
“The task of the modern educator is not to cut down jungles but to irrigate deserts. The right defence against false sentiments is to inculcate just sentiments. By starving the sensibility of our pupils we only make them easier prey to the propagandist when he comes. For famished nature will be avenged and a hard heart is no infallible protection against a soft head.”
More on Morality
More on Truth
“Morality is the basis of things and truth is the substance of all morality.”
“I'm concerned about a better world. I'm concerned about justice; I'm concerned about brotherhood; I'm concerned about truth. And when one is concerned about that, he can never advocate violence. For through violence you may murder a murderer, but you can't murder murder. Through violence you may murder a liar, but you can't establish truth. Through violence you may murder a hater, but you can't murder hate through violence. Darkness cannot put out darkness; only light can do that.”
“Ten truths must you find during the day; otherwise will you seek truth during the night, and your soul will have been hungry.”