Men are by nature merely indifferent to one another; but women are by nature enemies. Arthur Schopenhauer
When we believe ourselves in possession of the only truth, we are likely to be indifferent to common everyday truths. Eric Hoffer
The worst sin toward our fellow creatures is not to hate them, but to be indifferent to them: that's the essence of inhumanity. George Bernard Shaw
If a person loves only one other person and is indifferent to all others, his love is not love but a symbiotic attachment, or an enlarged egotism. Erich Fromm
Really high-minded people are indifferent to happiness, especially other people's. Bertrand Russell
He is master of another man's life who is indifferent to his own. Italian Proverb