Thinking Of The Trinity

Cum igitur ad confitendum Patrem, et Filium, et Spiritum sanctum aciem mentis intendimus, procul ab animo formas visibilium rerum et aetates temporalium naturarum, procul corpora locorum et loca corporum repellamus. Discedat a corde quod spatio extenditur, quod fine concluditur, et quidquid nec semper ubique, nec totum est. Cogitatio de Deitate Trinitatis concepta nihil per distantiam intelligat, nihil per gradus quaerat: ac si quid dignum de Deo senserit, nulli hoc ibi audeat negare personae, tamquam honorificentius Patri ascribat, quod Filio Spirituique non tribuat. Non est pietas Unigenito praeferre Genitorem; Filii contumelia Patris injuria est; quod uni demitur utrique detrahitur. Nam cum illis et sempiternitas sit communis et Deitas, nec omnipotens Pater, nec incommutabilis et Deitas, nec omnipotens Pater, nec incummutabilis aetimatur, si aut minorem se genuit, aut quem non habuit, habendo profecit. Sanctus Leo Magnus, Sermo LXXVII Cap IV Source: Migne PL 54.413b-c

When, therefore, we turn our minds to confessing the Father and the Son and the Holy Spirit, let us thrust far from the soul the forms of visible things and the spans of temporal natures, and all material bodies and places. Let that which is extended in space, that which is bound by limit, and whatever is not always everywhere and entire, be cut off from the heart. Thought of the Divine Trinity must understand nothing by separation; and if someone thinks something worthy of God, let him not dare to deny it to any of the Persons, like ascribing more honour to the Father, which he does not give to the Son and Spirit. It is not pious to put the Father before the Only Begotten. A slight to the Son is an insult to the Father; what is denied to one is refused both. For when their Eternity and Divinity are common, the Father is accounted neither omnipotent nor Divinity unchangeable if He begot One less than Himself, or gained by having One whom before He did not. Pope Leo the Great, from Sermon 77 Chap 4