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

In this poem, when the speaker says he "may sit and rightly spell," he refers to

elements of the world.

Explanation:

The lines show the pot's yearning for a prophetic vision, with which he can see all the stars that the creator has created, and all the plants and herbs that grow on earth.

He wishes to attain this experience so as to understand the true all encompassing knowledge of the world around him which he believes can only come with this godlike power.

Sitting down and rightly spelling it out here means the ease of knowledge of a prophetic strain.