God always uses a means – whether taken from among creatures or chosen freely – by which he reveals himself to human beings. By signs and symbols he makes his presence felt by them; by acts he proclaims his attributes; by speech and language he makes known to them his will and mind. Even in cases where he reveals himself internally in the human consciousness by his Spirit, this revelation always occurs organically and hence mediately. The distance between the Creator and creature is much too great for human beings to perceive God directly. The finite is not capable of containing the infinite.
Bavinck, Reformed Dogmatics (Baker, 2003), Vol. 1: Prolegomena, p309-310