If you want to keep a written "cross section" of your thoughts now, and revisit them in the future, at your convenience, leave a message "encapsuled" here. You can also write a note to someone else to be delivered after 25, 30, 40 years...Time modifies everything. I believe that nothing of what one could write at one moment could be even recognized with precision in the future and that is the charm I see in this. It is a proof of intents. Also the only way to return to what one once felt and to discover the instability of the human character. How long can one stand for a cause unchanged? What is the time limit of a belief?
It is also possible to "communicate" with people after death. This site facilitates the means to do so, if you have the means to pay for it...well, it is innexpensive. Strangely enough they have a trial version of it!