William Blake (born 28 November 1757, died 12 August 1827) is an English poet.
The first four lines are found by Lara Croft in a letter from her father.
And a heaven in a wild flower,
Hold infinity in the palm of your handAnd eternity in an hour.
These lead her to a book containing the poem in which she then finds a more important letter hidden by her father.
The first line will also help her to find the last missing piece of the Triangle of Light, later throughout the adventure.