On: The Essence of Time. Essays On Mastering The Shortness of Life is a contemplative book that delves into the philosophy of maximising our limited time on Earth. Inspired by the teachings of Seneca, the book is structured as an anthology of essays, each exploring a different aspect of living a meaningful life. Key themes include acknowledging the finiteness of life, embracing change, cherishing small pleasures, overcoming regrets, and avoiding procrastination. The book emphasises the importance of self-awareness, mental resilience, striving for excellence rather than perfection, and maintaining focus amidst distractions. The narrative intertwines stories of individuals like Oliver, who, after facing a life-altering illness, realise the importance of living each day to its fullest. The book advises readers to lead a purposeful life by setting meaningful goals, acknowledging the impermanence of life, and finding joy in every moment. It stresses the significance of courage and gratitude, self-awareness, strength of mind, and the balance between striving for excellence and accepting imperfection. The book's overarching message is to live intentionally and with purpose, focusing on what truly matters, staying strong amidst life's challenges, and appreciating even the most minor victories. It guides readers to let go of unproductive pursuits and embrace activities that bring genuine fulfilment and peace.