Which literary device is shown in this line from the poem “Love after Love”?

The line from the poem "Love after Love" refers to the literary device of metaphor. Unfortunately, the provided line is missing which prevents me from identifying the specific literary device used.

To determine which literary device is shown in a specific line from the poem "Love after Love," we need to analyze the line in question. Please provide the specific line you would like me to analyze.

To love oneself is the beginning of a lifelong romance.

The literary device shown in this line is personification.