The lines you provided employ several literary devices, primarily simile and imagery.
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Simile: The phrase "like a visitation" and "like antelope standing in the dawn mist" are examples of simile, which is a comparison between two different things using "like" or "as." This comparison helps create a vivid image or feeling associated with the subject.
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Imagery: The description of "gentleness" and "antelope standing in the dawn mist" evokes strong visual images, appealing to the senses and creating a mood that enhances the emotional resonance of the text.
Together, these devices contribute to the overall tone and emotional depth of the lines, effectively conveying a sense of tenderness and ethereality.