But as this was an ineffectual protest, I then said, more particularly, that I was not sure of my qualifications. That I was inexperienced in the art of adapting my mind to minds very differently situated, and addressing them from suitable points of view. That I had not that delicate knowledge of the heart which must be essential to such a work. That I had much to learn, myself, before I could teach others, and that I could not confide in my good intentions alone. 
But as this was ineffectual, I then said that I was not sure of my qualifications for such work - that I had much to learn, myself, before I could teach others. 