Ryōshin shiken

"ADDITION 2 Since the first line of the diagram represents the first examen, and the second line the second examen, the exercitant can see at night if there is an improvement from the first line to the second, i.e. from the first examen to the second. 

ADDITION 3 The second day should be compared with the first, i.e. today’s two examens with yesterday’s two examens, to see if there is an improvement from one day to another. 

ADDITION 4 One week should be compared with another to see if there is an improvement between the present week and the preceding. 

NOTE The first two long lines in the following diagram stand for Sunday, the second shorter ones for Monday, the third for Tuesday, and so on."

Munitiz, Joseph; Ignatius Of Loyola,. Personal Writings (Penguin Classics) (pp. 290-291). Penguin UK. Kindle Edition.

 How do we know if we improve without measuring?  I'm not yet measuring the right things.