The Fowler and the Viper_英语寓言故事

a fowler, taking his bird-lime and his twigs, went out to catch
birds.
seeing a thrush sitting upon a tree, he wished to take
it, and fitting his twigs to a proper length, watched intently,
having his whole thoughts directed towards the sky.
while thus
looking upwards, he unknowingly trod upon a viper asleep just
before his feet.
the viper, turning about, stung him, and
falling into a swoon, the man said to himself, "woe is me! that
while i purposed to hunt another, i am myself fallen unawares
into the snares of death."