The collect for today, the Feast of St John the Evangelist, from the 1662 Book of Common Prayer:

Merciful Lord, we beseech thee to cast thy bright beams of light upon thy Church, that it being enlightened by the doctrine of thy blessed Apostle and Evangelist Saint John may so walk in the light of thy truth, that it may at length attain to the light of everlasting life; through Jesus Christ our Lord. Amen.

The Epistle: 1 St John 1:1-10
The Gospel: St John 21:19-25

More on St John here.

Painting: Titian, Saint John the Evangelist on Patmos, c 1547