“Of these the first is "melting," which is opposed to freezing. For things that are frozen, are closely bound together, so as to be hard to pierce. But it belongs to love that the appetite is fitted to receive the good which is loved, inasmuch as the object loved is in the lover…Consequently the freezing or hardening of the heart is a disposition incompatible with love: while melting denotes a softening of the heart, whereby the heart shows itself to be ready for the entrance of the beloved.”
I-II, q. 28, art. 5
Summa Theologica (1265–1274)
Context: it is to be observed that four proximate effects may be ascribed to love: viz. melting, enjoyment, languor, and fervor. Of these the first is "melting," which is opposed to freezing. For things that are frozen, are closely bound together, so as to be hard to pierce. But it belongs to love that the appetite is fitted to receive the good which is loved, inasmuch as the object loved is in the lover... Consequently the freezing or hardening of the heart is a disposition incompatible with love: while melting denotes a softening of the heart, whereby the heart shows itself to be ready for the entrance of the beloved.
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Thomas Aquinas 104
Italian Dominican scholastic philosopher of the Roman Catho… 1225–1274Related quotes

An Intimate History of Humanity (1994)
Context: Even Gandhi, with all his charisma, did not "melt the hearts" of his oppressors, as he had hoped. After softening, hearts harden again. Asoka too was wrong to think that he was changing the course of history, and that his righteousness would last "as long as the sun and the moon."
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 229.

Snow Bound, reported in Bartlett's Familiar Quotations, 10th ed. (1919)