Robert Louis Stevenson

Children, you are very little,
And your bones are very brittle;
If you would grow great and stately,
You must try to walk sedately.

You must still be bright and quiet,
And content with simple diet;
And remain, through all bewild'ring,
Innocent and honest children.

Happy hearts and happy faces,
Happy play in grassy places--
That was how in ancient ages,
Children grew to kings and sages.

But the unkind and the unruly,
And the sort who eat unduly,
They must never hope for glory--
Theirs is quite a different story!

Cruel children, crying babies,
All grow up as geese and gabies,
Hated, as their age increases,
By their nephews and their nieces.