It describes a person's ability to be calm and collected when encountering special emergency situations.

Homelessness

be light of heart; a carefree type without a single worry; freedom from care;

show ingratitude for favours; heartless;

without a tie in the world; be free of all constraints and attachments; have no cares;

inexhaustible; boundless; endless;

as clear as noonday; as clear as the sun at noonday;

The whole world joins in the jubilation.

have a beginning and an end; carry sth. through to the end; finish what was started;