Our Rabbis explain the text, ’And the superfluities of the earth’ (Eccl. 5:8) as signifying that even things which seem to you superfluous in the world, such as flies, fleas, and gnats, are also included in the scheme of the creation of the world; as it is written, “And the heaven and the earth were finished, and all the host of them” (Gen. 2:1). [Soncino Translation]