In "Lines Composed a Few Miles About Tintern Abbey (1798), Wordsworth evaluates his relationship with nature and the memories he had, contrasting how this relationship was in the past and how it is now.
In line 36 he mentions another gift that comes with age. This marks the passing of time and how he has matured. When he was a young boy, nature and the psysichal and material joy of it made all his world. The mountains, rivers and streams marked his passions and love. Now an old man, even if he cannot resume that relationship, he does not mourn because with age he has acquired a different relationship, more sublime in a spiritual way. He can now hear oftentimes "The still, sad music of humanity" and guard the heart of his moral being.
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