quia ipse nobis mandavit, ut ad hunc modum oraremus [oremus], promisitque se nos exauditurum esse. Amen Amen, id est, vere, certe, haec ita fient
quia – because; ipse – he himself; nobis – to us; ut – that; ad – in, according to; hunc – this; modum – manner; oraremus [oremus] – we pray; promisit – promise; -que – and; se – he [reflexive]; nos – use; exauditurum esse – will hear [future infinitive]; id est – that is; vere – true; certe – certain; haec – these; ita – thus; fient – will be
because he himself mandates to us [he commands us], that we pray in this manner, and promises that he will hear us. Amen Amen, that is, true, certain, thus these things will be