What does this quote mean?

“Climb the mountains and get their good tidings.”

Muir presents mountain experience as something that can restore perspective and emotional steadiness through direct contact with wild landscapes.

Source note: Our National Parks; Muir follows the invitation with an account of nature’s peace flowing into the observer, linking mountains with restoration and attention.

“Sweet is the lore which Nature brings.”

Nature is presented as a source of knowledge that can complement formal study by training attention and receptiveness.

Source note: The Tables Turned; the line follows Wordsworth’s claim that a vernal wood can teach moral insight.

“Nature never did betray the heart that loved her.”

Wordsworth describes long attention to nature as a dependable source of memory, quietness, and moral perspective.

Source note: Lines Written a Few Miles above Tintern Abbey.

“This is true freedom, a good practical sort of immortality.”

Muir describes freedom as absorption in immediate natural experience, where ordinary anxiety about saving time temporarily loses its force.

Source note: My First Summer in the Sierra, June 13; the sentence follows his reflection on not hurrying like the trees and stars.

“Consider the lilies of the field, how they grow; they toil not, neither do they spin:”

Attention is directed to ordinary flowers as a corrective to anxious preoccupation, making observation itself part of the teaching about worry.

Source note: Matthew 6:28, King James Version; Jesus points listeners to the lilies while discussing anxiety about clothing and material provision.

“The mind is its own place.”

The statement emphasizes how mental framing can alter the experience of circumstances, for good or ill.

Source note: Paradise Lost, Book I; the fuller sentence continues with heaven and hell as states the mind can make.