'Diligence' in the Bible

For behold how much diligence this very [thing], being grieved according to [the will of] God, has brought about in you: what defense [of yourselves], what indignation, what fear, what longing, what zeal, what punishment! In everything you have demonstrated yourselves to be innocent in this matter.

Consequently, even if I wrote to you, it was not because of the one who did wrong or because of the one who had been wronged, but in order that your diligence {on our behalf} might be revealed to you before God.

But just as you excel in everything--in faith and in speaking and in knowledge and with all diligence and in the love from us [that is] in you--so may you excel in this grace also.

I am not saying [this] as a command, but proving the genuineness of your love by means of the diligence of others.