Know Yourself

Let each man learn to know himself

To gain that knowledge, let him labor

Improve those failings in himself

Which he condemns so in his neighbor

How lenient our  own faults we view

And conscience's voice adeptly smother 

Yet, oh how harshly we review 

The selfsame failings in another 

And if you meet an erring one 

Whose deeds are blamable and thoughtless

Consider, ere you cast the stone 

If you yourself are pure and faultless

Oh listen to that small voice within

Whose whisperings oft make men confounded

And trumpet not another's sin.

You'd blush deep in your own were sounded

And in self judgement if you find

Your deeds to others are superior

To you has Providence been kind

As you should be to those inferior

Example sheds a genial ray

Of light which men are apt to borrow

So first improve yourself today

And then improve your friends tomorrow

-  Old Hymn "Let Each Man Come to Know Himself", by Philip de la Mere