The Vervain enthusiasm can be infectious, and they feel a strong need to persuade others to their own point of view. But at an extreme, they are in danger of becoming fanatics, unable to listen to alternative points of view, and they may put themselves under a great deal of stress because they find it so hard to switch off and relax.
When we are in this state the remedy helps us regain our balance so that body and mind and be restored. It encourages the wisdom to enjoy life and the passage of time instead of always feeling the need to be active.
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