Discipline is an index to doctrine.

For those women sin against God when they rub their skin with ointments, stain their cheeks with rouge, and make their eyes prominent with antimony. To them, I suppose, the artistic skill of God is displeasing!

[Hermogenes] despises God's law in his painting, maintains repeated marriages [almost certainly a reference to remarrying after divorce or perhaps even widowhood, which Tertullian, who became a Montanist, opposed], alleges the law of God in defense of lust [likely same reference], and yet despises it in respect of his art.

[T]he Father, the Son, and the Holy Ghost [are] three ... not in condition, but in degree; not in substance, but in form; not in power, but in aspect; yet of one substance, and of one condition, and of one power, inasmuch as He is one God, from whom these degrees and forms and aspects are reckoned, under the name of the Father, and of the Son, and of the Holy Ghost.

He who lives only to benefit himself confers on the world a benefit when he dies.

He is a man, who is to be a man; the fruit is always present in the seed.

Patience is God's nature.