I have found these lyrics finally. Copied from the web.

Wolfgang

TRUTH AND UNDERSTANDING (R. Kavana, G. Lupari; tune: trad.)

You Irishmen so true and brave who would auld Ireland save
From those of cruel persuasion out to destroy this nation
Let us all united stand, stop the bold oppressor's band
Not with bomb or gun in hand but by truth and understanding

Who fears to speak of ninety-eight on the road to Stormont's gate
From Vinegar Hill a lesson learned, all good men join together
Seize the chance before it's gone, sing aloud this joyous song
This land is ours all and one by truth and understanding

Let reconciliation be our watchword for the future
Let's build a bridge of peace to stand for coming generations
Don't go back to how it was, to killing men for freedom's cause
Observe our common Christian laws of truth and understanding

So Irishmen be true and brave, if you would old Ireland save
From those of cruel persuasion out to destroy this nation
Let us all united stand, stop the bold oppressor's band
Not with bomb or gun in hand but by truth and understanding