A point of honour
Definition 1 of 1
Pro Tip 1/3Cultural Importance
Understand the phrase's value in different cultures where honor is highly regarded. 
In many cultures, returning a favor is a point of honour.
Pro Tip 2/3Context Sensitive
Use the phrase in situations involving moral principles or personal ethics. 
She considered keeping her promise a point of honour, despite the difficulties.
Pro Tip 3/3Personal Commitment
Express the phrase as a form of personal commitment rather than a casual statement. 
He made it a point of honour to always be truthful to his friends.