A method for concentrating
Nuns, monks, preachers and the people they educated were to visualize the material they were processing. A branchy tree or a finely feathered angel. The images might loosely correspond to the substance of an idea.
The point was to give the mind something to draw, to indulge its appetite for interesting forms while sorting its ideas into some logical structure.
If your mind can conceive it, and your heart can believe it, you can achieve it.
FROM THE ARTICLE
MORE LIKE THIS
Deep Work: How to Develop the Most Valuable Skill of the 21st Century
How And When Did People Get Married In The Medieval Period?