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Before you even start to negotiate for readjustment of salary in your present position to seek employment elsewhere, be sure that you are worth more than you now receive.
You should know your strengths in order to call attention to it when selling your services.
You can know yourself only through accurate analysis.
You should know all of your weaknesses in order that you may either bridge them or eliminate them entirely.
Most people are too indifferent or lazy to apply the facts with which to think accurately.
They prefer to act on opinions created by guesswork or snub judgment.