Children, on account of their high natural warmth, are the proper subjects for inurement to cold.
This may apparently be explained as being based on inurement.
Suffering, like everything else, becomes much more bearable with inurement to it.
early 15c., in ure "in practice," from obsolete ure "work, practice, exercise, use," probably from Old French uevre, oeuvre "work," from Latin opera (see opus). Related: Inured; inuring.