Idioms are phrases which cannot be understood simply by looking at the meaning of the individual words in the phrase.
have the courage of one's convictions
to have enough courage and determination to work to achieve one's goals
The man has the courage of his convictions and will only do what he feels is right.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is defined as - a group of words whose meaning is different from the meanings of the individual words.