Prosperity never approacheth from fear the person that is excessively liberal, that giveth away without measure, that is possessed of extraordinary bravery, that practiseth the most rigid vows, and that is very proud of his wisdom. Prosperity doth not reside in one that is highly accomplished, nor in one that is without any accomplishment. She doth not desire a combination of all the virtues, nor is she pleased with the total absence of all virtues.

In plain words: Good fortune, pictured as a goddess, is scared away from people who go to extremes: giving away everything, being reckless in bravery, taking harsh vows, or being proud of their wisdom. She doesn't stay with someone too accomplished or with someone who has no skills at all. She prefers balance, not all virtues or none.