William Blake's "The Voice of the Ancient Bard" from 'Songs of Experience' (ca. 1826)

Youth of delight come hither:
And see the opening morn,
Image of truth new born.
Doubt is fled & clouds of reason.
Dark disputes & artful teazing.
Folly is an endless maze,
Tangled roots perplex her ways,
How many have fallen there!
They stumble all night over bones of the dead;
And feel they know not what but care;
And wish to lead others when they should be led.