EFFECTIVE

Charles Francis Adams, 19th century political figure and diplomat, kept a diary. One day he entered: "Went fishing with my son today--a day wasted." His son, Brook Adams, also kept a diary, which is still in existence. On that same day, Brook Adams made this entry: "Went fishing with my father--the most wonderful day of my life!" The father thought he was wasting his time while fishing with his son, but his son saw it as an investment of time. The only way to tell the difference between wasting and investing is to know one's ultimate purpose in life and to judge accordingly. 

Silas Shotwell, in Homemade, September, 1987. 

Efficiency: doing things right.
Effectiveness: doing the right things.

Not everything that counts can be counted. Not everything that can be counted counts. 

Dr. Charles Garfield.

Gadarene swine law: Merely because the group is in formation does not mean the group is on the right course.

Besides the noble art of getting things done, there is the noble art of leaving things undone. The wisdom of life consists in the elimination of non-essentials. 

Lin Yutang.