The Dhammapada
See the world as a bubble, a mirage.  Be non-attached
and death cannot touch you.
 (Dhammapada, verse 170)

Whatever an enemy may do, he cannot harm you as
much as your own wrongly directed thoughts.
Dhammapada, verse 42)

Hearing the truth, the wise become like a calm, unruffled
 (Dhammapada, verse 82)

Yet the teaching of the Buddha is simple: 'Cease to do
evil, learn to do good.  And purify your mind.'
(Dhammapada, verse 183)

The Dhammapada, sometimes known as The Path of the
, consists of 423 verses, arrange in 26 categories,
which are attributed to the Buddha.   A fifth century
commentary by Bhadantācariya Buddhaghosa provides
context for these verses in the form of more than three
hundred stories, but the Dhammapada itself is a book of
aphorisms, relating primarily to the themes of ethics,
enlightenment and proper behavior.  To some degree, it
can be considered as the Buddhist equivalent of the Book
of Proverbs, attributed to Solomon, from Judaeo-Christian
scripture.  Just as the Book of Proverbs is embedded in
the Old Testament, the
Dhammapada is part of the
Tipitaka, the Pali canon which, in its entirety, spans
thousands of pages.  (The edition offered by the Pal Text
Society spans more than 12,000 pages in fifty volumes,
and sells for around $2,000.)  But the
Dhammapada can
be read and enjoyed in isolation, and remains one of the
best known and most frequently quoted Buddhist texts.  

Stay away from the
stodgy  Mueller
translation, now more
than one hundred years
old, but still widely
available (for example
here).  I am a fan of
the Element Classics of
World Spirituality, which
has published a series
of classic texts in
intelligent, smartly
translated editions.  
They are beautifully
made, and include
good introductions, but
without a lot of
cumbersome footnotes.
 The Element text of
the Dhammapada is
edited by Anne Bancroft.