This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
I call no Goddess to inspire my strains,
A fabled Muse may suit a Bard that feigns;
Friend of my life! my ardent spirit burns,
And all the tribute of my heart returns,
For boons recorded, goodness ever new,
The gift still dearer, as the giver you.
Thou orb of day! thou other paler light!
And all ye many sparkling stars of night;
If aught that giver from my mind efface;
If I that giver's bounty e'er disgrace;
Then roll to me, along your wand'ring spheres,
Only to number out a villain's years!