Faith with Certitude

Our attitude towards certain hadith (sayings of Prophet Mohammad, the last prophet) should be that of an experimental scientist who tests the hypothesis or hitherto unproven statement(s) by experiencing it and not just talking about it. So far so, there isn't one hadith that I found against the intellect and reason, although it may go well beyond the both; none that is empty of wisdom, yet there are certainly of whose wisdom I'm ignorant of, and I don't need to know about it. Whatever there is in it, can be testified through practical application on ourselves; the truth of it will be manifested on that person. Al-Ghazali in his "Deliverance from Error" has said what I have been trying to put in hollow words in this way:

"[In order] to deal with doubts relative to the inspiration of a particular prophet ... we shall not arrive at certitude on this point except by ascertaining, either by ocular evidence or by reliable tradition the facts relating to that prophet. When we have ascertained the real nature of inspiration and proceed to the serious study of the Qur'an and the traditions, we shall then know certainly that Mohammed is the greatest of prophets. After that we should fortify our conviction by verifying the truth of his preaching and the salutary effect which it has upon the soul. We should verify in experience the truth of sentences such as the following: "He who makes his conduct accord with his knowledge receives from God more knowledge"; or this, "God delivers to the oppressor him who favors injustice"; or again, "Whosoever when rising in the morning has only one anxiety (to please God), God will preserve him from all anxiety in this world and the next." [Emphasis added]