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……………………………………......._„„„„„„„„| . |” . . _„| . . . . . . . . . . . ,||' . '||| . . ' . ,- . .|………
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. . . . . . . . . . . .| . . . . . . . . . . . ./ ./ . . . . .,,;;;;;; . . . . . . . . . .', . . . . . ',¯……………………………….
. . . . . . . . . . . .'-, . . . . . . . . . . . . . . .-~;;;;;;; . '' . . . . . . . . . . ', . . . . . ',………………………………..
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. . . . . . . . . . . . . . . . . .'-, ';;;;;;, . . . . . . . . . . . . . -' ,-' ,-'' . . . . ,' . . . . . .|……………………………….
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. . . . . . . . . . . | . . . . . .;;;;;' . . . . . . . . . / . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
<<Love that doth reign and live within my thought
2And built his seat within my captive breast,
3Clad in the arms wherein with me he fought,
4Oft in my face he doth his banner rest.
5But she that taught me love and suffer pain,
6My doubtful hope and eke my hot desire
7With shamefast look to shadow and refrain,
8Her smiling grace converteth straight to ire.
9And coward Love then to the heart apace
10Taketh his flight, where he doth lurk and plain
11His purpose lost, and dare not show his face.
12For my lord's guilt thus faultless bide I pain;
13Yet from my lord shall not my foot remove:
14Sweet is the death that taketh end by love.>>
First, you have to realize that love is personified (made human, a character) in the poem. It is the lord that reigns and builds his seat (his thrown) in the speakers breast. The speaker is saying that he/she is subservient to love and that this love is so profound that it shows visibly in his/her person (perhaps, as indicated by others, in a blush). The object of the speaker's desires sees this on his/her face, and she rejects that love. Then love removes itself from its visible manifestation on the speaker's face and hides in his/her heart. The speaker is hurt by this love, but he/she will not abandon it. The speaker ends the poem by stating that death brought on by love is sweet. This is all put into martial (military) language. This is used to show the conflict that love creates within the speaker. Reign, seat (in this context), captive, coward, lord, and banner all add to the idea that the speaker is a kind of soldier being lead by love, and though it may cause him/her pain and though it may bring about his/her death, the speaker will continue to love.