The acquirement of spiritual wisdom does not necessarily prevent us from making worldly mistakes; but because it develops the qualities that will prevent them, and because it takes to heart the lessons of experience, humbly and receptively, it does reduce the frequency of those mistakes.
The soul seeks to serve; it inspires the personality to serve in particular ways and means. As that happens we become less and less interested in the personality aspect and more and more concerned in altruistic service for the benefit of all. The soul has no sense of being an individual, separate self and knows nothing of separation. It sees only the whole and itself in relation to the whole.