Certainty Quote by Leonardo da Vinci
“We must doubt the certainty of everything which passes through the senses, but how much more ought we to doubt things contrary to the senses, such as the existence of God and the soul.”
About This Quote
Source Letter: Personal correspondence, c. 1500
Sensory experiences are unreliable; we should doubt both sensory data and metaphysical claims like God or soul.
In simple terms: Question all knowledge, even beyond the senses.
Cultivate critical inquiry.
Themes
Mood
Type
When to use this quote
- scientific research
- ethical debates
- personal belief systems
- education curricula
Key Concepts
Questions to Reflect On
- What evidence justifies belief beyond the senses?
- How do we balance doubt with faith?
Doubt can lead to paralysis.