'Prudently' in the Bible

'And the lord commended the unrighteous steward that he did prudently, because the sons of this age are more prudent than the sons of the light, in respect to their generation.

Conduct yourself with wisdom in your interactions with outsiders (non-believers), make the most of each opportunity [treating it as something precious].

In a similar way urge the young men to be sensible and self-controlled and to behave wisely [taking life seriously].