The concept of truth is complex and can be approached from philosophical, logical, and practical perspectives. Generally, something is considered as being “true” when it accurately reflects reality or corresponds to facts.
Some people think truth is subjective and their opinion – so something can be ‘true for them’. But that is not truth – truth is objective and absolute.
You may believe something is true if you read it in a sacred text or were told it by a religious leader. Christianity even says you are blessed if you believe without evidence
A humanist is more likely to believe something is true if they have seen the evidence themselves (or from a trustworthy source) and can judge it to be valid and accurate.
What's Humanism? 