If the pull-up resistor is enabled (gpio0 is set to 1) then
cat /sys/class/gpio/gpio14/value
always returns 1, regardless of the voltage applied to IO2, and if pull-up resistor is disabled (gpio0 is set to 0) then
cat /sys/class/gpio/gpio14/value
always returns 0, regardless of the voltage applied to IO2.
The same applies to setting gpio1 and reading IO3 (gpio15).
Tony