Verse 1 of the sequence Sancti spiritus assit nobis gratia (Cantus ID ah53070) quoted in T (opening):

1--fg--g--h--g--k--j--k--h--g--f--g--g--4

"Sancti spiritus assit nobis gratia"
(GOEDE 1965, No. 25)

Verse 2a of the sequence Sancti spiritus assit nobis gratia (Cantus ID ah53070) quoted in T (2nd phrase)

1--k--kj--h--k--l--k--g--k--j--k--h--g--f--g--g--4

"Quae corda nostra sibi faciat habitaculum."
(GOEDE 1965, No. 25)

Verse 9b of the sequence Sancti spiritus assit nobis gratia (Cantus ID ah53070), similar melodic line, transposed, in T (3rd phrase)

1--dg--f--e--f--d--dg--f--e--f--g--h--g--f--g--g--4

"Tu aspirando das spiritales esse homines"
(GOEDE 1965, No. 25)

Lines 2-4 of the first stanza of the hymn Veni creator spiritus (Cantus ID 008407) quoted in T (4th phrase to end)

1--k--g--h--k--lk--l--m--l--k--lm--kj--hg--kl--g--h---k--jk---h---gf---h--hjh---g--fg--g--4

"mentes tuorum visita / imple superna gratia / quae tu creasti, pectora."
(LH 90)