12/10/2026
In leadership and decision-making, unexamined assumptions can be particularly costly. We may interpret people's actions, organisational challenges or even data through beliefs we have held for years. Good leadership requires the willingness to distinguish what we know from what we merely assume.
What is the difference between a thought, an assumption and a belief?
These three get mixed up all the time, and the mix-up can affect how we see ourselves and others.
A thought is something that passes through our mind. "She did not reply to my message."
An assumption is something we take to be true without enough evidence. "She is upset with me."
A belief is something we have come to accept as true, sometimes without questioning it. "People always pull away from me."
Notice how one experience can lead to an assumption, and how repeated assumptions can eventually shape what we believe.
We may not even realise when this happens.
The goal is not to stop having thoughts or assumptions. It is to become more aware of what we are accepting as true.
What have you been treating as a fact that might actually be an assumption?
— The Serene Analyst™