It's...

it’s easy to say – I’ll do this, and I’ll do that

it’s also easy to answer a tit with a tat

but it’s not easy to hold a secret under your hat

say one word, and next you’ll be squealing like a rat.

It’s hard to be strong when the devil tempts you so

It’s also very hard to be as meek as a doe

Especially when someone acts in such a way

That you can no longer hold your temper at bay

Then you find that you’d like to spank him

Though you should practice charity, and kindly forgive him