"Zeal without knowledge is the sister of folly."

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One would always want to think of oneself as being on the side of love, ready to recognize it and wish it well -but, when confronted with it in others, one so often resented it, questioned its true nature, secretly dismissed the particular instance as folly or promiscuity. Was it merely jealousy, or a reluctance to admit so noble and enviable a sentiment in anyone but oneself?

— Shirley Hazzard