Algebras (jabbre and maqabeleh) are geometric facts which are proved by propositions five and six of Book two of Elements.

Why, all the Saints and Sages who discuss'd Of the Two Worlds so wisely - they are thrust Like foolish Prophets forth; their Words to Scorn Are scattered, and their mouths are stopped with Dust.

Up from Earth's Centre through the Seventh Gate rose, and on the Throne of Saturn sate; And many a Knot unravel'd by the Road; But not the Master-knot of Human Fate.

A hair divides what is false and true.

To-day is thine to spend, but not to-morrow; Counting on morrows breedeth bankrupt sorrow: O squander not this breath that Heaven hath lent thee; Make not too sure another breath to borrow.

I came like Water, and like Wind I go.

I hide my grief, just like the blessed birds hide themselves when they are preparing to die, my love.