15 We begin the fast of forty days on the ninth of the month Phamenoth; and having, in these days, served the Lord with abstinence, and first purified ourselves, we commence also the holy Easter on the fourteenth of the month Pharmuthi (April 9). Afterwards, extending the fast to the seventh day, on the seventeenth of the month, let us rest late in the evening. And the light of the Lord having first dawned upon us, and the holy Sunday on which our Lord rose shining upon us, we should rejoice and be glad with the joy which arises from good works, during the seven weeks which remain— to Pentecost— giving glory to the Father, and saying, 'This is the day which the Lord has made: we will rejoice and be glad in it, ' through our Lord and Saviour Jesus Christ, through Whom to the same, and to His Father, be glory and dominion for ever and ever. Amen. Salute one another with a holy kiss. All the brethren who are with me salute you. That you may have health in the Lord, I pray, brethren beloved.
Here ends the eleventh Letter of holy Athanasius.
Source: Letters (New Advent)