執 means 'hold on to'

Tenacity binds these essays together, sometimes as the secondary sense of characters. The literal stickiness of 粘 (e.g., natto, clay, and snail mucus!) inspired the figurative meaning "tenacity," as in "stick-to-it-ness." Mainly, 執 involves performing tasks (often by wielding long, thin objects such as pens or batons), but as "tenacity" this kanji drives words about persistence, obsession, and grudges. The whole bundle showcases adherence to beliefs and goals, doing things thoroughly, and seeing things through (e.g., athletes who accomplish greatness). These essays also depict the dark side of such devotion—namely, obstinacy, self-centeredness, discord, monomania, ill health, and more.