Truth vs. Missionary Zeal?

I have received the fallowing question. The writer is known to me, so that the prerequisite of signing your name to questions sent to this department is met, even though I do not attach the name of the writer. Here is the question: “I believe that inasmuch as we have the purest manifestation of the truth, our hearts should burn with the desire to tell it to others and win them to Christ Instead of this our attitude seems to be cold and indifferent to­wards the lost. One cannot help but feel...