Why is critical reading a two-way street?

"spring, the sweet " from summer's last will and testament spring, the sweet spring, is the year's pleasant king, then blooms each thing, then maids dance in a ring, cold doth not sting, the pretty birds do sing: cuckoo, jug-jug 1 , pu-we, to-witta-woo! the palm2 and may3 make country houses gay, lambs frisk and play, the shepherds pipe4 all day and we hear aye5 birds tune this merry lay6: cuckoo, jug-jug, pu-we, to-witta-woo! the fields breathe sweet, the daisies kiss our feet, young lovers meet, old wives a-sunning sit, in every street these tunes our ears do greet: cuckoo, jugjug, pu-we, to-witta-woo! spring, the sweet spring! –thomas nashe jug-jug: sound of the nightingale palm: willow may: hawthorn pipe: play a shepherd's flute aye: always lay: song choose the sense that the poet appeals to in the last two lines of each stanza.

1. a poem that tells a story irony 2. taking on human characteristics narrative 3. a direct comparison between two things personification 4. words that are opposite the thoughts in a speaker's mind simile 5. implied comparison introduced with "as" and "like idiom 6. one's own manner of speaking metaphor

Why is reasoning relivant to reading and evaluate text?