Falsehoods are like castles built of sand, where great effort may go into their construction, but are washed away when Truth, like waves, meet them. Eventually they return to the ocean.
The mountains are ground down to the seas. Thoughts give way to feeling. Feeling to archetypes to Truth. The ocean of the mind and heavens so large, yet a drop in the ocean of Truth - That Which IS.
The seeker puts away the separation, falseness of intent, toward the One. Drops the thoughts, attitudes, actions of falsehood toward that Light of Truth. Through love climbs toward oneself. While intention is the key to capacity; sincerity is the key to intention.
Teachings or attitudes may last for years or thousands of years, like pyramids, but will eventually give way to Truth.
That Which IS makes itself known and re-members upon and into IT AS. No thing stands in the way of this ocean and lasts.
The sincere seeker places himself or herself within the current of absorption - willingly easing the way toward dissolution of self identification; gives way to the ocean of Being, Love, Peace, Truth.
How is it that "truth will out"? It is its nature. All else a diversion, hindrance, temporary - lesser aspects, all lessons, pointing toward their source.