"Common Sense, How to Exercise It" by Yoritomo-Tashi is a philosophical treatise written during the early 20th century. 

The work explores the concept of common sense, which the author defines as the sound judgment derived from a balanced understanding of truth and conduct. The text emphasizes the cultivation of qualities that contribute to effective decision-making and the dangers of being misled by impulse and sentimentality. 

At the start of the work, Yoritomo-Tashi outlines the essence of common sense, likening it to a plant that requires careful nurturing to thrive. He delves into the components that make up common sense, such as perception, reasoning, and memory, while illustrating the implications of neglecting these qualities through engaging allegories. 

The book reflects on how common sense is essential for discerning truth and navigating life's complexities, ultimately guiding readers toward personal growth and practical wisdom. 

Yoritomo-Tashi was a philosopher, well known and admired by his people and one of the greatest statesmen that Japan has ever had. 

Yoritomo-Tashi worked as a senior official for the state and wrote extensively on philopsophical subjects. 

The three great pillars of his teachings were reflected in his trio of books:

Common Sense: How to Exercise it, Influence-How to Exert it and Timidity-How to Overcome it