…people are perfectionists with a keen sense of justice. They are blessed with extreme mental energy that they willingly throw into the causes they believe in.
Those with fixed principles and ideas, which they are confident are right, and which they very rarely change. They have a great wish to convert all around them to their own views of life. They are strong of will and have much courage when they are convinced of those things that they wish to teach. In illness, they struggle on long after many would have given up their duties.
– The Twelve Healers and Other Remedies