You can converse with them, and they with you.

You will also be able, at your desire, to see the parted spirits of dead persons, so long as they linger within Earth's radius, which they seldom do, being always anxious to escape from it as soon as possible.
Love may sometimes detain them, or remorse; but even these have to yield to the superior longings which possess them the instant they are set free.

You will, in your intercourse with your fellow-mortals, be able to discern their motives quickly and unerringly--you will at once discover where you are loved and where you are disliked; and not all the learning and logic of so-called philosophers shall be able to cloud your instinct.

You will have a keener appreciation of good and beautiful things--a delightful sense of humour, and invariable cheerfulness; and whatever you do, unless you make some mistake by your own folly, will carry with it its success.

And, what is perhaps a greater privilege, you will find that all who are brought into very close contact with you will be beneficially influenced, or the reverse, exactly as you choose to exert your power.