I can't change the direction of the wind, but I can adjust my sails to always reach my destination.
We cannot direct the wind, but we can adjust the sails.
If my ship sails from sight, it doesn't mean my journey ends, it simply means the river bends.
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
The effect of sailing is produced by a judicious arrangement of the sails to the direction of the wind.