Prayer and Heaven

Ἡ τοῦ Κυρίου διδαχὴ ἐν τῇ προσευχῇ μετὰ πάντων τῶν ἄλλων θεοπρεπῶν διδαγμάτων, καὶ, 'Γενηθήτω τὸ θέλημά σου, ὡς ἐν οὐρανῷ καὶ ἐπὶ τῆς γῆς,' κελεύει προσεύχεσθαι τὴν τῶν ἄνω δυνάμεων εἰρήνην, τὴν ἀστασίαστον φάσκουσα, ἤν καὶ ἡμῖν βραβεῦσαι τοῖς ἐπὶ γῆς καταξίωσον· ἵν' ὥσπερ ἐν αὐταῖς πάντα κατορθοῦται θελήματα, οὕτως καὶ ἐν ἡμῖν τά σοι εὐάρεστα γένηται. Ταῦτα τοίνυν καὶ πρώην εἰδὼς, καὶ νῦν μαθὼν παρ' ἐμοῦ ἐπιλαβοῦ, καὶ ἔχου ἀπρὶξ τῆς εἰρήνης. Οὐράνιος γάρ ἐστι καὶ Θεῷ πλησιάζουσα. Ἅγιος Ἰσίδωρος Του Πηλουσιώτου, Βιβλιον Πρῶτον, Ἐπιστολή ΠΕ', Οὐρσενουφιῳ

The teaching of the Lord on prayer which is before every other lesson befitting God, is 'Be your will done on earth as it is in heaven.'1 He says to pray is the peace of the powers above, which separate from all else is judged obtainable even by us who are on the earth, that as in them the will is perfected, so it may be by us gifted even to you. These things, then, knowing beforehand, learning them now from my possession of them, you also may lay tight hold on peace. For it is heavenly to have drawn near God. Saint Isidore of Pelusium, Book 1, Letter 85, To Ursenuphius  1 Mt 6.10