Poison Tree - Don't plant it in your garden

I was angry with my friend:

I told my wrath, my wrath did end.

I was angry with my foe;

I told it not, my wrath did grow.
And I water'd it in fears,

Night & morning with my tears;

And I sunned it with my smiles

And with soft deceitful wiles.
And it grew both day and night,

Till it bore an apple bright;

And my foe beheld it shine,

And he knew that it was mine,
And into my garden stole

When the night had veil'd the pole:

In the morning glad I see

My foe outstretch'd beneath the tree

-William Blake