He that is down needs fear no fall, He that is low no pride. He that is humble ever shall Have God to be his guide.

-Bunyan,John
  The Pilgrim's Progress, pt.2.

This only grant me, that my means may lie Too low for envy, for contempt too high.

-Cowley, Abraham
  Essays, in Verse and Prose,'Of Myself'.

A foggy day in LondonTown Had me low and had me down.

-Gershwin, Ira originally Israel Gershowitz
  'A Foggy Day', song from the musical Damsel in Distress (music by George Gershwin).

Tar-Baby, she stay still, en Brer Fox, he lay low.

-Harris,Joel Chandler
  Uncle Remus: His Songs and His Sayings,'The Wonderful Tar-Baby Story'.

Holland†lies so low they're only saved by being dammed.

-Honorius of Autun
  Up the Rhine,'Letter from Martha Penny to Rebecca Page'.

Come sleep,O sleep, the certain knot of peace, The baiting place of wit, the balm of woe, The poor man's wealth, the prisoner's release, The indifferent judge between the high and low.

-Shute, Nevil originally Nevil Shute Norway
Astrophel and Stella, sonnet 39.

The rate of profit does not, like rent and wages, rise with the prosperity, and fall with the declension, of the society.On the contrary, it is naturally low in rich, and high in poor countries, and it is always highest in the countries which are going fastest to ruin.

-Smith, Adam
  An Inquiry into the Nature and Causes of theWealth of Nations, bk.1, ch.11, conclusion.

   Sweet and low, sweet and low, Wind of the western sea, Low, low, breathe and blow, Wind of the western sea! Over the rolling waters go, Come from the dying moon, and blow, Blow him again to me; While my little one, while my pretty one, sleeps. Sleep and rest, sleep and rest, Father will come to thee soon; Rest, rest, on mother's breast, Father will come to thee soon; Father will come to his babe in the nest, Silver sails all out of the west Under the silver moon: Sleep, my little one, sleep, my pretty one, sleep.

-Tennyson
  The Princess, pt.3, added song, stanzas1^2.