Round the Sphere Again: Three on the Trinity

No Single Verse
states the whole doctrine, and yet it’s the key to the whole Bible (Justin Taylor quoting Fred Sanders).

No Misleading Analogies
Carl Trueman on teaching the Trinity to kids:

Young children do not generally think in abstractions; thus a lot of theological content simply passes them by; but the teacher can instill in them knowledge of a form of sound words which subsequent intellectual growth under the preaching of the word will flesh out.  The danger is that young minds can be taken captive early on by bad pictures; and these bad pictures then distort what they hear preached and taught as they grow up.

(Reformation21 Blog)

Not From Anathanasius
A concise history of the Athanasian creed.

This creed is an example of how the church, throughout history, has a concern for the great truths of the faith. The Athanasian Creed was not merely an add-on to the appendix of a church constitution. Instead, the church connected the theology of the Creed to the daily life of faith. As such, the Athanasian Creed provides us with a beautiful example of the interplay between theology and worship.

(The Resurgence)