Here are some Latin phrases that you can use to impress your Sunday School class:

Cupio dissolvi - I wish to be dissolved (Phil 1:23-24)

Deus in adjutorium meum intende - O God, come to my assistance (Ps 70:1)

Gloria in excelsis Deo - Glory to God in the highest

In necessariis unitas, in dubiis libertas, in omnibus caritas - In necessary things unity; in uncertain things freedom; in everything compassion

In saecula saeculorum - Forever and ever (Rev 22:5)

Odium theologicum - Theological hatred (the intense, and even sinful, anger generated in theological disputes)

Ordo salutis - Order of salvation

Post tenebras lux - Light after darkness (Job 17:12)

Sola fide - By faith alone

Sola gratia - By grace alone

Sola scriptura - By Scripture alone

Soli Deo Gloria - Glory to God alone

Solus Christus - Christ alone

Veritas vos liberabit - The truth shall set you free (John 8:32)

Vince in bono malum - Overcome evil with good (Rom 12:21)