If I remember rightly the Buddha is quoted as saying something along the lines of:
Do not believe anything I say until you can prove it by yourself
In what text(s) of the Buddhist cannon is this quoted?
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“Now, Kalamas, don’t go by reports, by legends, by traditions, by scripture, by logical conjecture, by inference, by analogies, by agreement through pondering views, by probability, or by the thought, ‘This contemplative is our teacher.’ When you know for yourselves that, ‘These qualities are skillful; these qualities are blameless; these qualities are praised by the wise; these qualities, when adopted & carried out, lead to welfare & to happiness’ — then you should enter & remain in them.
Buddha says that common sense and logical thinking is not enough to determine the truth. Only through his/her own experience or the experience of the wise ones one can be sure what to follow.
The quote comes from Kalama Sutra (AN 3.65) and is often taken out of context, hence misunderstood.
People of Kalama found themselves bombarded by tens of spiritual teachers, each claiming authority and expertise in spiritual matters. These teachers' doctrines were rather different from each other, but each was presented as The truth. Each teacher seemed quite certain of himself and was able to articulate the teaching logically.
When Buddha on one of his tours around the country arrived at Kalama and presented his teaching, the citizens honestly told him, that what he posits as The truth, to them looks like yet another teaching. "Is there any way" they asked, "that we can figure out which of these teachings is real?"
And that's when Buddha gave his famous answer, the point of which:
It is by its results that a teaching should be evaluated.
According to Buddha, all these are secondary factors, that can't be used as identifying markers of Sat-Dharma (True/Eternal Law/Tradition). Instead, it is by the effects it brings out, both in student's psyche as well as in the world, that a teaching should be measured.
Sat-Dharma is famously good in the beginning, good in the middle and good in the end.
Good in the beginning means, even the outermost layer of Dharma, the one seen by non-Buddhists, has good influence on people. Even the laypeople who don't really practice, but are merely guided by basic Dharma principles, benefit from it. They find that Dharma not only happens to match their highest secular moral and wisdom, but that while secular moral is often too flexible, the compass of Dharma never wavers. When followed at large, True Dharma must lead to reduced suffering and increased harmony in daily lives of common people.
Good in the middle means, when someone practices a slightly superficial version of Dharma, without fully understanding it yet, it greatly reduces amount of suffering one generates inside and around. Student learns to watch his mind and recognize its state, learns to stay mindful of the body and notice arising emotions, learns to not let harmful thoughts and emotions control him, learns to let go of attachments and preconceptions. This leads to increased quality of life, as the student can now stay cool through various life challenges.
Good in the end means, one eventually arrives at Liberating Realization, whereby one is no longer dominated by arbitrary formations, but can instead juggle formations freely.
While some kind of "Good in the end" is obviously the goal of all alternative teachings, it is "Good in the middle" and "Good in the beginning" that is a characteristic mark of True Dharma.
So when Gotama said, "do not believe anything I say until you can prove it by yourself" (or however you want to put it), this is what he meant. He did not mean we should reject a teaching unless it matches our preconceptions. He meant we should evaluate a teaching by its effect on our lives. The proof is in the pudding.
A text of the Buddhist Canon this quote is said to come from is the Kalama Sutta; which is often misquoted and misrepresented. The Kalama Sutta basically recommends judging a path by its results, namely, does this method of practice lead to more wholesome states? It isn't a "charter for free enquiry" as some claim, or an invitation to indulge personal views.