These views were expressed with extraordinary vigour and incisiveness in his Letter from Sydney (1829), published while he was still in prison, but composed with such graphic power that it has been continually quoted as if written on the spot.
As a diplomatist he displayed many brilliant qualities - adroitness in negotiation, incisiveness in argument and elegance in style.
There are, of course, many other parallels with St Mark, and at some points the two documents seem to overlap and to relate the same incidents in somewhat different forms. There is the same use of parables from nature, the same incisiveness of speech and employment of paradox, the same demand to sacrifice all to Him and for His cause, the same importunate claim made by Him on the human soul.