See also the Google Saffron search engine linked to in my signature. A search on the Kalama Sutta will yield several interesting results. Be aware though there are some terrible misrepresentations of the Kalama Sutta out there, so be careful with any that take liberties to re-write it according to their own agenda. The one Ben links to is fine.
"Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'." (Snp 3.6)
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)