“Mystery and disappointment are not absolutely indispensable to the growth of love, but they are, very often, its powerful auxiliaries. 'Out of sight, out of mind,' is well enough as a proverb applicable to cases of friendship, though absence is not always necessary to hollowness of heart, even between friends, and truth and honesty, like precious stones, are perhaps most easily imitated at a distance, when the counterfeits often pass for real. Love, however, is very materially assisted by a warm and active imagination: which has a long memory, and will thrive, for a considerable time, on very slight and sparing food. Thus it is, that it often attains its most luxuriant growth in separation and under circumstances of the utmost difficulty.”