This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Why, why tell thy lover,
Bliss he never must enjoy?
Why, why undeceive him,
And give all his hopes the lie?
O why, while fancy, raptur'd, slumbers,
Chloris, Chloris all the theme!
Why, why wouldst thou, cruel,
Wake thy lover from his dream?