What does this quote mean?

“And the peace of God, which passeth all understanding, shall keep your hearts and minds.”

Peace is described as guarding both thought and feeling even when circumstances are not fully explained or controlled.

Source note: Philippians 4:7 in the King James Version; excerpt before the concluding phrase.

“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.

“Simplicity is a state of mind.”

Simplicity is defined first as an inward orientation rather than a particular income, occupation, costume or social class.

Source note: The Simple Life, Chapter II, Mary Louise Hendee translation, Project Gutenberg #23092; Wagner is defining the “essence of simplicity.”

“Nothing can bring you peace but yourself.”

The sentence places lasting peace in self-command rather than approval, status, or external circumstances.

Source note: Essay “Self-Reliance.”

“Take therefore no thought for the morrow.”

The teaching redirects attention from imagined future trouble toward responsibilities that actually belong to today.

Source note: Matthew 6:34 in the King James Version; the opening sentence is quoted here.

“You can control nothing but your own mind.”

Bennett redirects the desire to manage other people or circumstances toward the sphere he treats as directly governable: one’s own response and attention.

Source note: The Human Machine, discussion of mental control. The maxim belongs to Bennett’s period self-discipline philosophy and should not be read as a clinical claim that thoughts or symptoms are always voluntarily controllable.