Philosophers have pondered over the problem of Truth at great length, but the ordinary person scarcely gives it any consideration.
How does one recognize the truth?
According to the Sages, there are several ways of doing so, and sometimes they have to be used in combination.
For example, there is the test of harmony; truth has to fit in harmoniously with reality.
Another test is that of eternity, the fact that a truth lasts and does not change.
Still another, far less philosophic, mark of truth is that it creates in one a click, an immediate responsiveness.
–Rabbi Adin Steinsaltz
From "The Two Ways of Tikkun" in In the Beginning by Rabbi Adin Steinsaltz