Ante-Nicene Fathers, Vol VIII:
Pseudo-Clementine Literature.: Chapter XIV

Chapter XIV.—No Man Has Universal Knowledge.

Then Peter said:  “These things come not only from envy or indignation; but sometimes there is a bashfulness in some persons, lest haply they may not be able to answer fully the questions that may be proposed, and so they avoid the discovery of their want of skill.  But no one ought to be ashamed of this, because there is no man who ought to profess that he knows all things; for there is only One who knows all things, even He who also made all things.  For if our Master declared that He knew not the day and the hour whose signs even He foretold, and referred the whole to the Father, how shall we account it disgraceful to confess that we are ignorant of some things, since in this we have the example of our Master?  But this only we profess, that we know those things which we have learned from the true Prophet; and that those things have been delivered to us by the true Prophet, which He judged to be sufficient for human knowledge.”