Resurrection and Sacraments

Cujus quidem diem paschalis resurrectionis mysticum non solum pro eo celebramus, quod in eodem a mortuis resurrexit, sed etiam et pro aliis sacramentis. Quia enim, sicut dicit Apostolus, mortuus est propter delicta nostra, et resurrexit propter justificationem nostram, transitus quidem de morte ad vitam in illa passione Domini et resurrectione sacratas est. Nam et vocabulum ipsum, quod pascha dicitur, non Graecum sed Hebraeum est; necque a passione, quoniam παθειν Graece dicitur pati sed a transitu Hebraeo verbo pascha appellata est,. Quod et maxime evangelista expressit, cum celebraretur a Domino pascha cum discipulis: 'Cum vidisset,' inquit, 'Iesus quia venit hora ut transiret de mundo ad Patrem.' Transitus ergo de hac vita mortali in aliam vitam immortalem, hoc est, de morte ad vitam, in passione et resurrectione Domini commendatur. Hic transitus a nobis modo agitur per fidem, quae nobis datur in remissione peccatorum, quando consepelimur cum Christo per baptismum, quasi a mortuis transeuntes de pejoribus ad meliora, de corporalibus ad spiritualia, de conversatione hujus vitae ad spem futurae resurrectionis et gloriae. Propter ipsum ergo initium novae vitae, ad quam transimus, et propter novum hominem quem jubemur induere, et exuere veteram, expurgantes vetus fermentum, ut simus nova conspersio, quoniam pascha nostrum immolatus est Christus; propter hanc ergo viate novitatem primus mensis in anni mensibus celebrationi huic attributus est, nam et ipse dicitur mensis novorum. Quia vero in toto tempore saeculi nunc tertium tempus apparuit, ideo resurrectio Domini triduana est. Primum enim tempus est ante legum secundum sub lege, tertium sub gratia; ubi iam manifestatum est sacramentum  quod erat ante in prophetico aenigmate occultum. Hoc ergo et in lunari numero significatur. Quia enim septenarius numerus solet in Scripturis ad quamdam perfectionem mysticus apparere, in tertia hebdomada lunae pascha celebratur, id est, qui dies occurrerit a quarta decima in vicesimam primam. Sed et non solum propter tempus tertium quia inde incipit hebdomada tertia, sed etiam propter ipsam conversionem lunae. Tunc enim illa ab inferioribus ad superiora converitur, et haec nobis de luna similitudo assumitur, de visibilibus ad invisibilia, et de corporalibus ad spiritualia sacramenta transire, ut magis magisque huic saeculo moriamur, et vita nostra abscondatur cum Christo, omnemque lucem studii nostri, quae ad inferiora vergebat, ad superiora convertamus, ad illam scilicet aeternam contemplationem immutabilis veritatis. Usque ad vicesimam vero primam ideo Pascha observatur, propter septenarium numerum, quo universitatis significatio saepe figuratur, qui etiam ipsi Ecclesiae tribuitur, propter instar universitatis; ideoque et Joannes apostolus, in Apocalypsi, septem scripsit Ecclesiis. Ecclesia vero adhuc in ista mortalitatis carne constituta propter ipsam mutabilitatem lunae nomine in Scripturis saepe vocatur. Sanctus Isidorus Hispalensis, De Ecclesiasticis Officiis, Cap XXXII

The day of His paschal resurrection we celebrate not only for that, that He rose from the dead that day, but also for the other sacraments. Because, as the Apostle said, 'He died for our sins and was raised for our justification' 1, the passing from death to life having in that passion and resurrection of the Lord been made sacred. For the word itself which is spoken 'Pascha' is not Greek but Hebrew, and it is not named from 'passion' because the Greek 'pathein' means to suffer but from the Hebrew word that means to pass over. Certainly the evangelist announced this when the Passover was celebrated by the Lord with his disciples, when it says: 'Whence Jesus saw that the hour had come that He pass from the world to the Father.' 2 Therefore the passing over is from this mortal life into another immortal life, that is, from death to life, being honored in the passion and resurrection of the Lord. This passing over is now done by us through faith which is given to us in the remission of sins when we are buried with Christ in baptism, 3 as passing from the dead, from the worse to the better, from bodies to spirits, from the state of this life to the hope of the future resurrection and glory. Therefore, on account of this beginning of the new life to which we are passing over and because of that new person we are ordered to put on, and to take off the old, cleaning off the old grain so that we may be a new scattering, our paschal lamb, Christ, has been sacrificed 4. Therefore on account of this newness of life, the first month of the year is assigned to this celebration, 5 and it is called the month of new things. Because in the whole time of the age the third time period has appeared, therefore the resurrection of the Lord is a three day period. The first time is before the law, the second under the law, the third under grace when is now made manifest the mystery was once hidden in prophetic obscurity. This, then, is also signified in the lunar number, for since seven is accustomed to appear in Scripture as a mystical number for a kind of perfection, The Pasch is celebrated during the third week of the lunar cycle, that is, a day falling from the fourteenth to the twenty first. But it is not only because it is the third time period that it begins the third week but even on account of the turning of the moon. For then it is changing from lesser to greater. This fact about the moon seems to us to be a similitude concerning the passing over from visible things to invisible, and from the body to the spiritual sacraments that more and more we might die to this world and our life be hidden with Christ, 6 and every light of our struggles which was turned to lower things we should turn to higher things, to that eternal contemplation of immutable truth. Until the twenty first, then, the Pasch is observed on account of the number seven, by which the meaning of completeness is often signified, and this is also attributed to the Church herself on account of the mark of universality, and therefore John the Apostle in the Apocalypse wrote to the seven churches. 7 And the Church still yet in this mortal flesh established, on account on the same mutability, by the name of the moon is often signified in the Scriptures. Saint Isidore of Seville, On Ecclesiastical Duties, Chap 32 1 Rom 4.25 2 John 13.1 3 Rom 6.4  4 1 Cor 5.7 5 Exod 12.2 6 Col3.3 7 Rev 1.4