Complete the sentences based on your reading of this excerpt from "Il Penseroso" by John Milton: Where I may sit and rightly spell
Of every Star that Heav'n doth shew,
And every Herb that sips the dew;
Till old experience do attain
To somthing like Prophetic strain.
In this poem, when the speaker says he "may sit and rightly spell," he refers to
The phrase "Prophetic strain" means