Looking for Latin version of
“History is the witness that testifies to the passing of time; it illumines reality, vitalizes memory, provides guidance in daily life, and brings us tidings of antiquity.”
Marcus Tullius Cicero 106-43 B.C., “Pro Publio Sestio”, II, 36
http://www.archive.org/details/mtulliciceronisp00cicerich
Download in the form you want (see list at the left). I'd choose PDF.
OR
http://books.google.com/books?id=ahBHAAAAIAAJ&printsec=frontcover&dq=%22Pro+Publio+Sestio%22+Cicero&source=bl&ots=NWSlzGcoQI&sig=SDk_5ahB5_ShWhzsrxhiZgba83Y&hl=en&ei=19PSS9vFJYT7lwfc-uDtDA&sa=X&oi=book_result&ct=result&resnum=4&ved=0CBoQ6AEwAw#v=onepage&q&f=false
Scroll down to the table of contents in blue links, and choose the section you want.
If you don't find what you need in one of these online books, then you'll need to get to a good library!