"Forget Not Yet" is a poem that is based around the desire of the speaker to commend himself to his lover as he talks about the many hardships he has faced and the sufferings he has endured to enable to recommend himself to her:
Forget not yet the great assays,
The cruel wrongs, the scornful ways,
The painful patience in denays
Forget not yet.
It appears from the pleading tone that runs throughout the poem that the speaker is trying to remonstrate with his lover and to try and encourage her to not dismiss him or end their relationship. The repetition of the phrase "Forget not yet" at the start and end of each stanza form a kind of refrain as the speaker fills the content of each stanza with proof of his devotion and love for his beloved and reasons why she should not "forget" the strength and depth of his love for her. The final stanza in particular demonstrates his most powerful argument:
Forget not yet thine own approved,
The which so long hath thee so loved,
Whose steadfast faith yet never moved,
Forget not this.
The change of the wording of the final line to "Forget not this" shows how this is the last gambit of the speaker, focusing his beloved's mind on the depth of his affection for her and the constancy of his affection for her.