'Reason' in the Bible

But I have not made use of any of these [rights]. And I am not writing these [things] in order that it may be thus with me. For [it would be] better to me rather to die than [for] anyone to deprive me of my reason for boasting.

For if I proclaim the gospel, it is not to me a reason for boasting, for necessity is imposed on me. For woe is to me if I do not proclaim the gospel.