ICognitive Bias
Confirmation Bias
Your bias is Confirmation. Favoring evidence that supports what you already believe.
Why This Bias Happens
When the mind has invested in a view, it seeks inner peace by defending that view. Doubt feels like danger, so we collect friendly facts and turn away from discordant ones. This is the old instinct for safety at work inside modern argument.
Example 1
In Letters from a Stoic, Seneca repeatedly warns Lucilius against choosing teachers who only flatter prior opinions. The lesson is simple: if you only hear agreement, you have stopped learning.
Example 2
In Thinking, Fast and Slow, Kahneman describes how people test hypotheses by searching for confirming evidence, which strengthens initial judgments even when the data set is incomplete.