Contrasting Imagery

These temporary apprehensions, so vague but so awful, derived a wondrous potency from the contrasting serenity of the weather, in which, beneath all its blue blandness, some thought there lurked a devilish charm, as for days and days we voyaged along, through seas so wearily, lonesomely mild, that all space, in repugnance to our vengeful errand, seemed vacating itself of life before our urn-like prow.