What does this quote mean?

“To mourn a mischief that is past and gone is the next way to draw new mischief on.”

Grief over what cannot be changed can become a second injury when it prevents attention to what can still be done.

Source note: Othello, Act 1, Scene 3; the Duke urges Brabantio not to compound an irreversible loss by continuing to feed it with fresh grief.

“Some things are in our control and others not.”

The opening distinction of the Enchiridion asks people to separate what depends on their own judgment and action from what does not.

Source note: Classical work; English wording varies by translation.

“He who binds to himself a joy does the winged life destroy.”

Trying to possess a joyful moment permanently can damage it, while accepting impermanence allows experience to remain alive and free.

Source note: Short poem commonly titled “Eternity”; Blake contrasts grasping with the passing movement of joy.

“Take away thy opinion, and then there is taken away the complaint, “I have been harmed.””

The statement asks whether part of suffering is sustained by the story attached to an event rather than by the event alone.

Source note: Meditations, Book IV, in George Long’s translation.

“The readiness is all.”

The emphasis is not on controlling every outcome but on meeting what comes with preparedness and acceptance.

Source note: Act 5, Scene 2.

“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.