Kenneth Vogt over at Lifehack asks whether or not you know your purpose when you set a goal: "How you structure your goals has a big impact on whether or not your purpose is actualized.
For instance, many people set goals that are fundamentally in the
control of others. If you set a goal for a specific person to buy a
specific product from you, you may be dismayed. If your goal is to have a
certain person love you, you are rather attempting to impress a goal on
that other person. Sometimes this succeeds, but often as not it fails
and the disappointment can be devastating."
More commentary from Mr. Vogt: "A better approach would be to set a sales goal that does not require a
specific buyer or the sale of a particular product. It is better to
have the goal to be lovable rather than to be loved. Of course,
circumstances sometimes dictate details that must be reconciled, despite
not being optimal. It is good to be clear in these situations that our
purpose is not tied to this specific goal’s achievement; such a goal may
support our purpose in success but it cannot take away from our purpose
in failure."