Chronos refers to the concept of linear, sequential, and measurable time as experienced in a consistent and orderly manner. It is often associated with the quantitative measurement of time, emphasizing its regular and predictable nature. Unlike kairos, which focuses on opportune moments, chronos deals with the continuous progression of time, enabling us to organize events, schedules, and historical records in a logical sequence. Though chronos plays a fundamental role in everyday life, Essentialism argues that getting caught up in the cycle of planning, coordination, and busyness—all functional aspects of chronos—keeps individuals from fully experiencing the moment and focusing on what matters.

Clarity is the state of having a clear understanding of what is essential and what is nonessential. It involves the ability to discern priorities, make intentional choices, and eliminate unnecessary distractions. Lacking clarity leads to difficulty in sorting through the myriad options and potential commitments that present themselves while having clarity enables individuals to align their actions with their purpose and make meaningful contributions in their personal and professional lives.

Essentialism, a theory of living invented by Greg McKeown, refers to the disciplined pursuit of less and focusing on what truly matters to an individual. It is the central theme and guiding principle throughout the work.