All time is really NOW; past, present and future are all happening right this very moment. This isn't some flaky philosophy. Einstein and many other gifted physicists have proven this to be true. This is why all lives we have ever or will ever live are accessible to us in present time. There is no limit.
It can be very helpful for us to make contact with a client's future life who has already mastered the current life's lessons. The future self will joyfully help the client release resistance and blockages. Often this future life will even give the client's current incarnation exactly the vibration he is reaching for.
This is identical to the "letting go of the past" process, simply viewed from the other direction. Just as we can help our client's past lives, so can the client's future lives help him. The power of this technique cannot be overestimated.