This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Wee, sleekit, cow'rin, tim'rous beastie,
O, what a panic's in thy breastie!
Thou need na start awa sae hasty,
Wi' bickering brattle!
I wad be laith to rin an' chase thee,
Wi' murd'ring pattle!
I'm truly sorry man's dominion
Has broken Nature's social union,
An' justifies that ill opinion,
Which makes thee startle,
At me, thy poor, earth-born companion,
An' fellow-mortal!
I doubt na, whiles, but thou may thieve;
What then? poor beastie, thou maun live!
A daimen-icker in a thrave
'S a sma' request:
I'll get a blessin wi' the lave,
And never miss't!
Thy wee bit housie, too, in ruin!
Its silly wa's the win's are strewin!
An' naething, now, to big a new ane,
O' foggage green;
An' bleak December's winds ensuin,
Baith snell an' keen!
Thou saw the fields laid bare an' waste,
An' weary winter comin fast,
An' cozie here, beneath the blast,
Thou thought to dwell,
Till crash! the cruel coulter past,
Out thro' thy cell.
That wee bit heap o' leaves an' stibble,
Has cost thee mony a weary nibble!
Now thou's turn'd out, for a' thy trouble,
But house or hald,
To thole the winter's sleety dribble,
An' cranreuch cauld!
But, Mousie, thou art no thy lane,
In proving foresight may be vain:
The best laid schemes o' mice an' men
Gang aft a-gley,
An' lea'e us nought but grief an' pain,
For promis'd joy.
Still thou art blest, compar'd wi' me!
The present only toucheth thee:
But, Och! I backward cast my e'e
On prospects drear!
An' forward, tho' I canna see,
I guess an' fear!