If one can summarize this discussion in one sentence, it would be:
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Be ‘tolerant’ to other faiths or schools of thoughts or mazhabs
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While Prof. Ishaq reached his state of mind after reading books of other faiths, we all must be tolerant to other faiths even if we haven’t read the books of other faiths.
It is that simple. In fact our tolerance must extend to our neighbors, our city, our country, and this universe. that means we should not treat Christians, Jews, Hindus or other faiths in any less tolerant way than a Sunni would treat a Shia (or vise versa).