poison Tree

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 watered 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 veiled the pole:
In the morning glad I see
My foe outstretched beneath the tree

William Blake

Today in bus i realized i was reciting some lines without my knowledge and later i realized it was lines from william blake's poison tree one of my favorite poems from college.
If you think it is a simple nursery rhyme , reread to understand the depth and truth in it , It actually upholds tolereance and frankness which in present society we seem to have lost.