This couplet describes a state where the clear flow of rational thought has not been sidetracked or lost in the barren wasteland of outdated and unproductive habits. It emphasizes the importance of preserving independent reason over blind adherence to custom.

This line beautifully encourages us to think for ourselves! It asks us to live in a place where our clear, logical thoughts and understanding don't get swallowed up by old, unthinking habits or traditions that no longer serve a purpose. Imagine your mind as a flowing river, always fresh and clear. The poet hopes this river doesn't get lost in a dry, dull desert of outdated customs, where new ideas can't grow. It's an invitation to keep our minds active, questioning, and independent, rather than just blindly following what's always been done. This way, our reasoning stays sharp and guides us forward.