Sherab wrote:If your nature is changeable, buddhahood is not attainable since if your nature is changeable, the buddhahood attained could also change.
If your nature is unchangeable, no amount of practice will enable you to attain buddhahood, since your nature is unchangeable.
Yet Buddha taught that there is path to buddhahood.
And Buddha also taught that buddhahood is not attained.
The premise is misunderstood.
But in the context of the question, buddhahood already exists, so you are correct, it is not attained.
What you describe as "your nature" is actually the things that obscure realization of the real "your nature", which is buddhahood.
So, yes, your nature is unchangable. Practice is merely there to remove the obscurations.
It is like sweeping the dust off the floor. The floor doesn't change at all. Only the condition is changed from dirty to clean.