''My heart aches, and a drowsy numbness pains
My sense, as though of hemlock I had drunk'.'
- Who wrote these lines?

My heart aches, and a drowsy numbness pains
My sense, as though of hemlock I had drunk,

Or emptied some dull opiate to the drains
One minute past, and Lethe-wards had sunk:

’Tis not through envy of thy happy lot,
But being too happy in thine happiness,

That thou, light-wingèd Dryad of the trees,
In some melodious plot
Of beechen green, and shadows numberless,
Singest of summer in full-throated ease.

- Ode to a Nightingale
By John Keats.