This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
O why the deuce should I repine,
And be an ill foreboder?
I'm twenty-three, and five feet nine—
I'll go and be a sodger.
I gat some gear wi' meikle care,
I held it weel thegither;
But now it's gain and something mair,
I'll go and be a sodger.