Notes

1] The source of the poem is Petrarch's 140th (109th) sonnet (Mestica, 213-14):

Amor, che nel penser mio vive e regna,
E 'l suo seggio maggior nel mio cor têne,
Talor armato ne la fronte vêne:
Ivi si loca, et ivi pon sua insegna.
Quella ch' amare e sofferir ne 'nsegna,
E vôl che 'l gran desio, l' accesa spene
Ragion, vergogna e reverenza affrene,
Di nostro ardir fra sé stessa si sdegna.
Onde Amor paventoso fugge al core,
Lasciando ogni sua impresa, e piange e trema;
Ivi s'asconde, e non appar piú fôre.
Che poss' io far, temendo il mio signore,
Se non star seco infin a l' ora estrema?
Ché bel fin fa chi ben amando more.

Title: "The lover for shamefastnesse hideth his desire within his faithfull hart."

longë: lasting (the final "e" was probably sounded).
harbour: temporarily reside.

2] hert: Egerton MS. spelling (also line 9), playing on "hart" (=deer) and "heart."

4] spreading his banner: the look of someone in love, displayed unashamedly (a lord showing himself openly on the field of battle).

5] learneth: teaches.

6] will: to will, i.e., to make sure that.
trust and lustës negligence: (public) confidence (in her love) and the neglect (of propriety in showing) sexual desire (for her).

7] rayned: Egerton MS. spelling, playing on "reined" and "reigned."

8] his: the god of Love's.
hardiness: boldness.

9] the hert's forest: a phrase not in Petrarch, one that plays on "hart's"=(deer's) and "heart's."

13] in the field with him: inconsistent with line 9 (the lord has fled to the forest).

Other poems by Sir Thomas Wyatt