"Achieving a state devoid of doubt is the essence of martial arts." (Kazumi Tabata, "Secret Tactics: Lessons From the Great Masters of Martial Arts", 2003)
"At the bottom of great doubt lies great awakening. If you doubt fully, you will awaken fully." (Hakuin Ekaku)
"For the unified mind in accord with the Way all self-centered striving ceases. Doubts and irresolutions vanish and life in true faith is possible. With a single stroke we are freed from bondage; nothing clings to us and we hold nothing. All is empty, clear, self-illuminating, with no exertion of the mind's power." (Jianzhi Sengcan)
"If you are going to doubt something, doubt your limits." (Don Ward)
"If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things." (René Descartes)
“Learning dissipates many doubts, and causes things otherwise invisible to be seen, and is the eye of everyone who is not absolutely blind.” (Hitopadesa)
"The beginning of wisdom is found in doubting; by doubting we come to the question, and by seeking we may come upon the truth." (Pierre Abélard)
"You are your own teacher. Looking for teachers can’t solve your own doubts. Investigate yourself to find the truth - inside, not outside. Knowing yourself is most important." (Ajahn Chah)
