A Riddle in Poetry

You wanted a hint, I’ll give you a hint.
They are the lines that rhyme
When you wake up early morning.
They are the rhythm of knowledge
That you will never reach,
What keep you warm,
What leave you to sink in
Brown leaves.
They never come too close,
Never gone too far.
They keep you company
Since you were born,
And until you die.
What are they?