In ancient times, it was understood that our youth and time as a single was precious, as it is the time for us to prepare ourselves for marriage. Those who do not prepare fail. Many marriages fail simply because one or both persons were not strong as a single; they mistakenly thought only a marriage would make them strong.
Man and woman are two columns that hold up a temple. Each column must be strong on its own, able to stand alone. Only two strong columns can support the weight of a temple; if one is weak, or both are weak, they will break, and the temple will fall.