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In love, it is a sign the passion is predominant, if the lover be not only pleased in the enjoyment of the beloved object (for that’s ordinary), but also troubled and grieved at the absence of it. After a manner not unlike this, many youngsters (as I’ve observed) stand affected at the study of philosophy. At first, they buckle to their work with the greatest concern and emulation imaginable; but as soon as ever they are diverted, either by business or any little pretences, the heat of their affection immediately flies off, and they sit down ignorant and very well content. But He that perceives the pleasing sting of love, Whose poignant joy his trembling heart doth move, From Sophocles, Frag. 757.