Q: all things [are] pure to the pure; but to the defiled and unbelieving nothing [is] pure; but both their mind and their conscience are defiled.
A: All things [are] pure to the pure; but to the defiled and unbelieving nothing [is] pure; but both their mind and their conscience are defiled.

Q: in addition, each alteration was a reason, so that a common response to and never will.
A: In addition, each alteration was a reason, so that a common response to and never will.

Q: van kampen became interested in pontryagin 's duality and wrote sixteen papers on this topic, including an excellent survey article published in 1935.
A: Van Kampen became interested in Pontryagin 's duality and wrote sixteen papers on this topic, including an excellent survey article published in 1935.

Q: the book contains "42 delightfully diverting mind-benders", puzzles which dodgson was working on at the time he died.
A:
The book contains "42 delightfully diverting mind-benders", puzzles which Dodgson was working on at the time he died.