For Plato, rationalists and mystics can walk the same path:

For Plato, the sensory world is epistemologically fallible. True knowledge lies only with the Forms, which exist in a realm separate from the material universe and are accessible only through a person’s intellect, not their senses. This might explain why Plato often uses the word ‘theios’, meaning ‘divine’, to describe the Forms. Just as the mystery initiate seeks a special relationship with the divine, so does the philosopher seeking the Forms.

See also this and this and this.