Holiness has a lot to do with our temperaments. Many Christians hide behind psychological terms (and StrengthsFinder results) in order to excuse their unsavory behaviors. They’d say they are sanguine, or choleric, or futuristic, or activators in order to explain away the fact that they are mean and uncaring. J.I. Packer, in his book Rediscovering Holiness, argues that we are not victims of our personalities. When we got saved, Jesus redeemed our personalities too. Holiness is supposed to temper our personalities so that we will gradually become Christlike. Holiness is in fact another term for Christlikeness.