| Quote #1
The "unripe fruits" of Line 12 will, eventually, and in Nature's good time, transform into ripe fruit. Perhaps they're supposed to represent the kind of mind that the speaker used to possess, the kind of mind that could appreciate nature, but couldn't "see into the life of things" (49).
| Quote #2
I have […] felt in the blood, and felt along the heart;
The memory of the "beauteous forms" (22) actually causes a physical change in the speaker. He feels it "in the blood" and "along the heart." It's the healing power of nature.
| Quote #3
While here I stand, not only with the sense
As the speaker is standing on the banks of the Wye, soaking up the beauty he sees there, he imagines that in "future years" he'll be able to turn to these memories with "pleasure." He imagines that he'll continue to change and evolve as a result of his relationship with Nature.