The wanderings of your imagination by François Fénelon

Be not troubled by the wanderings of your imagination which you cannot
restrain. How often do we wander through the fear of wandering and
the regret that we have done so. What would you say of a traveler who,
instead of constantly advancing in his journey, should employ his time
in anticipating the falls he might suffer, or in weeping over the place
where one had happened?
François Fénelon