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The greatest gift and blessing from God that comes to men and women by receiving the ordinances of the temple, including being sealed as husband and wife and then sincerely seeking to keep the covenants made as part of those ordinances.
What is exaltation?
D&C 132: 19-20 - "which glory shall be a fulness and a continuation or the seeds forever and ever. Then shall they be gods, because they have no end; therefore shall they be from everlasting to everlasting because they continue; then shall they be above all, because all things are subject to them. Then shall they be gods, because they have all power, and the angels are subject to them."