There are still preserved among Christians traces of that Holy Spirit that appeared in the form of a dove. They expel evil spirits, perform many cures, and foresee certain events.
TertullianHow many men of rank (to say nothing of common people) have been delivered from devils, and healed of diseases!
TertullianNow then, you dogs, whom the apostle puts outside and who yelp at the God of truth, let us come to your various questions.
TertullianThus the connection of the Father in the Son, and of the Son in the Paraclete, produces three coherent Persons, who are yet distinct One from Another. These three are one [thing], not one [Person], as it is said, 'I and my Father are One,' in respect of unity of substance not singularity of number.
Tertullian