Mercy and grace are often confused. While the terms have similar meanings, grace and mercy are not the same. To summarize the difference: mercy is God not punishing us as our sins deserve, and grace is God blessing us despite the fact that we do not deserve it. Mercy is deliverance from judgment. Grace is extending kindness to the unworthy.
An expression of kind consideration or pity that brings relief to those who are disadvantaged; tender compassion; also, at times, a lightening of judgment or punishment. Mercy is a frequent translation of the Hebrew ra·chamim? and the Greek e?le·os (verb, e·le·e?o). An examination of these terms and their usage helps bring out their full flavor and sense. The Hebrew verb ra·cham? is defined as meaning “to glow, to feel warm with tender emotion; . . . to be compassionate.” (A Hebrew and Chaldee Lexicon, edited by B. Davies, 1957, p. 590) According to lexicographer Gesenius: “The primary idea seems to lie in cherishing, soothing, and in a gentle emotion of mind.” (A Hebrew and English Lexicon of the Old Testament, translated by E. Robinson, 1836, p. 939) The term is closely related to the word for “womb” or can refer to “bowels,” which are affected when one feels warm and tender sympathy or pity.—Compare Isa 63:15, 16; Jer 31:20