This document contains 11 quotes about competition: 1) Sherlock Holmes emphasizes the importance of data and facts in problem solving. 2) Issur Harel notes that intelligence work involves analyzing probabilities, not certainties, and that interpretation is key. 3) Sun Tzu states that to gain repeated victories, one must know both oneself and one's opponent. 4) Zig Ziglar identifies the five main obstacles to a sale as no need, no money, no hurry, no desire, and no trust. 5) Arie De Gues argues that an organization's ability to learn faster than competitors provides the only sustainable advantage.