This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Rusticity's ungainly form
May cloud the highest mind;
But when the heart is nobly warm,
The good excuse will find.
Propriety's cold cautious rules
Warm fervour may o'erlook;
But spare poor sensibility
The ungentle, harsh rebuke.