Objectives can be compared to a compass bearing by which a ship navigates. A compass bearing is firm, but in actual navigation, a ship may veer off its course for many miles. Without a compass bearing, a ship would neither find its port nor be able to estimate the time required to get there.
Peter DruckerThe monomaniac is unlikely to succeed. Most leave only their bleached bones in the roadless desert. But the rest of us, with our multiple interests instead of a single mission, are certain to fail and have no impact at all.
Peter Drucker