Karma

If you'd like to know what you would reap in next life,
Just look at whatever you have done in your daily life.
If you'd like to know what you had done in your past life,
Just look at what you have reaped it in your everyday life.

And if you'd like to change your karma or your personality, try to practice what is said in the following verse:

Do not do anything bad to yourself and anyone else;
Do anything good to yourself and everyone;
Keep you mind clear and pure day and night.
This is what the Buddha teaches.

The Buddha-nature is really empty, open, vast, immense, and limitless. There is not a thing in there. How can there be a past, a present, or a future. These are only concepts created by mind thinking, therefore, they are not real things.

Unfortunately, in these days, there are several persons created a theory of the "present moment" and then invoked people try to cling to it. This looks like they put a pole in the space and call people watch it, grasp it as possible as they can. For me, it seems that their followers look like some kind of cows tied to the pole with the invisible ropes, and just see the pole only. How pity they are!

Copied from: http://www.zenguide.com/principles/zen_buddhism_questions_answers.cfm?#Q4