The Holy Trinity as the three angels being hosted by Abraham at Mamre
Andrei Rublev
circa 1400
Tretyakov Gallery, Moscow, Russia
Public Domain

The Collect

ALMIGHTY and everlasting God, who hast given unto us thy servants grace, by the confession of a true faith to acknowledge the glory of the eternal Trinity, and in the power of thy Divine Majesty to worship the Unity; We beseech thee, that thou wouldst keep us steadfast in this faith, and evermore defend us from all adversities, who livest and reignest, one God, world without end. Amen.

DateAM PsalmsPM PsalmsO.T. and Holy DaysWeekdayNT, Holy Days, etc.
7-JunPs 29 Ps 30 2 Chr 12 Trinity Sunday: Ps. 29Rev 4:1-end; John 3:1-15
8-JunPs 31 Ps 32 2 Chr 13 & 2 Chr 14Monday1 Tim 5 
9-JunPs 33 Ps 34 2 Chr 15 Tuesday1 Tim 6 
10-JunPs 35 Ps 36 2 Chr 16 & 2 Chr 17 Wednesday2 Tim 1 
11-Jun : Saint BarnabasPs 37 Ps 38Acts 11:22-end; Ps 112; John 15:12-16Thursday2 Tim 2 
12-JunPs 39 Ps 40 2 Chr 18 Friday2 Tim 3 
13-JunPs 41Pss 42 & 432 Chr 19 Saturday2 Tim 4