The poem is just four short lines, each starting with "my," and the list builds in a way that quietly changes what we think it's doing. The first three items sound like parts of a body or a set of tools: a wing, a promise, a good ear. Then the last line lands on "my wife," and we realize the speaker has been describing her all along, or at least describing what she is to him.
The title, "Resourceful," suggests that these are the things he can draw on. She is what lifts him, what holds him to his word, and what listens when he needs to be heard. The speaker feels grateful and dependent, but without any fuss. There's no explanation or flourish, just a plain list.
The mood is tender and understated. Because the lines are so spare, the affection feels earned rather than gushing. A wing suggests flight and freedom, a promise suggests commitment, and a good ear suggests attention. Together they make a small portrait of a marriage as a source of strength.