New Revised Standard Version
And so they could not believe, because Isaiah also said,

Contemporary English Version
The people could not have faith in Jesus, because Isaiah had also said,

New American Bible
For this reason they could not believe, because again Isaiah said:

Douay-Rheims Bible
Therefore they could not believe, because Isaias said again:

Therefore they could not believe, because Isaias said again:

they.

John 5:44 How can you believe, who receive glory one from another: and the glory which is from God alone, you do not seek?

John 6:44 No man can come to me, except the Father, who hath sent me, draw him. And I will raise him up in the last day.

John 10:38 But if I do, though you will not believe me, believe the works: that you may know and believe that the Father is in me and I in the Father.

Isaiah 44:18-20 They have not known, nor understood: for their eyes are covered that they may not see, and that they may not understand with their heart. . . .

2 Peter 2:14 Having eyes full of adultery and of sin that ceaseth not: alluring unstable souls: having their heart exercised with covetousness: children of malediction.

because.

Isaiah 6:9,10 And he said: Go, and thou shalt say to this people: Hearing, hear, and understand not: and see the vision, and know it not. . . .