Present of General Truth.—The present is used to express an action that is true for all time:
ἄγει δὲ πρὸς φῶς τὴν ἀλήθειαν χρόνος
a. The present is an absolute tense in such sentences. The future, aorist, and perfect may also express a general truth.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].