Plans are worthless, but planning is everything. There is a very great distinction because when you are planning for an emergency you must start with this one thing: the very definition of “emergency” is that it is unexpected, therefore it is not going to happen the way you are planning.
– Dwight Eisenhower
No battle plan survives contact with the enemy.
– Colin Powell, others
The best-laid schemes o’ mice an’ men go often astray
– Robert Burns
Don’t worry, be happy.
– Bobby McFerrin