Ogden Nash Quote

It is common knowledge to every schoolboy and even every Bachelor of Arts,
That all sin is divided into two parts.
One kind of sin is called a sin of commission, and that is very important
And it is what you are doing when you are doing something you oughtn't...

"Portrait of the Artist as a Prematurely Old Man" in The Family Album of Favorite Poems (1959) edited by P. Edward Ernest.