Nothing if not diligent - Tradução em português

For his supporters, this was richly ironic – and monstrously unfair. In 2001, his predecessor John Paul II transferred the responsibility for dealing with sexual abuse cases to the Congregation for the Doctrine of the Faith (CDF), the Vatican department then headed by Ratzinger. Nothing if not diligent, the future Pope Benedict personally read much of the testimony and, say his apologists, he was deeply shocked and moved by what he learned.

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"Nothing If not sth" : this more than anything else
She is nothing if not ambitious.

Cambridge Dictionary of American Idioms

Diligent: (formal) showing care and effort in your work or duties
a diligent student/ worker

Nothing if not diligent" : Extremamente aplicado/assíduo.