This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Here's a bottle and an honest friend!
What wad ye wish for mair, man?
Wha kens, before his life may end,
What his share may be o' care, man?
Then catch the moments as they fly,
And use them as ye ought, man:—
Believe me, happiness is shy,
And comes not ay when sought, man.