Concise Optimism for Better Living (geek edition)

How does a science-fiction writer reconcile dreaming about the future with the practical probability that he may never live to see it? There is a simple mantra for increasing happiness and life satisfaction in this condition and lifestyle.
"Live the best today, build the best tomorrow, tell yourself that you'll live forever."

The current condition of your body and life should be optimised. If you die tomorrow, planning for a better tomorrow and a best today serves that outcome. If you deceive yourself into delusions of geriontological immortality, you will never think too small, you will never fear insurmountable mystery and have no need for regret with the (albeit unfounded) knowledge that all wrongs may in the future be righted and all errors corrected. Once you do die, you will not lament this misapprehension.