What a coincidence, I just purchased a few copies of Tozer's Pursuit of God today.
The season opener sermon series at my church is "Foundations."
The book was on the reading list and I wanted a few copies in the church library.
To start, I won't argue 'order of salvation'; IMO it's like arguing if toilet paper should go over or under ...it doesn't matter much at the end.
Tozer does write a bit loosely, as if he's writing for the interested general population rather than systematicians.
You noted that early in the chapter 'The Speaking Voice' of God encompassed general revelation; Tozer references Romans 1:20 and 2:15.
Imagine this, could the general, 'universal Voice,' be the light available to all mankind mentioned in the Gospel of John 1:5, 9?
John 1:5 The light shines in the darkness, and the darkness has not overcome it.
John 1:9 The true light, which gives light to everyone, was coming into the world.
The 'universal Voice' is invitational. Come all you who are weary... John 1:9; Romans 1:16-2:16; Romans 10:18; Titus 2:11.
The sheep that hear and respond come to Jesus.
Some will hear, ....others, not so much.
Rob