Occurrences in this domain are beyond the reach of exact prediction because of the variety of factors in operation, not because of any lack of order in nature.
An enemy always represents a weakness. This might be fear of physical pain, but it could also be a premature sense of victory or the desire to abandon the fight because it is no longer worthwhile.
Youth is the time to go flashing from one end of the world to the other to try the manners of different nations; to hear the chimes at midnight; to see the sunrise in town and country; to be converted at a revival; to circumnavigate the metaphysics, write halting verses, run a mile to see a fire, and wait all day long in the theatre to applaud Hernani.
Begin doing what you want to do now. We are not living in eternity. We have only this moment, sparkling like a star in our hand - and melting like a snowflake.