The importance of Proofreading

In 1631, a Bible was published that listed the Seventh Commandment in Exodus 20:14  as "Thou shalt commit adultery", mistakenly having omitted the word 'not' in the commandment. Naturally, the Church was not amused and fined the publishers severely!
Proofread at least twice, especially if it is a legal document or a document that will be read by the public to avoid extreme embarrassment, if not a lot of money too.