Agnosticism - What Is It?

"Modernist place the foundation of religious philosophy in that doctrine which is usually called Agnosticism.According to this teaching human reason is confined entirely within the field of phenomena,that is to say,to thing that are perceptible to the senses,and in the manner in which they are perceptible; it has no right and no power to transgress these limits.Hence it is incapable of lifting itself up to God,and of recognasing his existence,even by means of visible things.From this it is inferred that God can never be the direct object of science,and that,as regards history,he must not be considered as an historical subject.Given these premises,all will readily perceive what becomes of Natural Theology,of the motives of credibility,of external revelation."
Pius X, Pascendi
Dominici Gregis,
1907
"Huxley/T.H.Huxley/thought that as many of these people liked to describe themselves as adherents of various "isms" he would invent one for himself...Huxley thought that we would never be able to know about the ultimate origin and causes of the universe.Thus he seems to have been more like a Kantian believer in unknowable noumena than like a Vienna Circle proponent of the view that talk of God is not even meaningful.Perhaps such a logical positivist should be classified as neither a theist nor an atheist,but her view would be just as objectionable to the theist.Agnostic is more contextual than is "atheist",as it can be used in a non-theological way,as when a cosmologist might say that she is agnostic about string theory neither believing nor disbelieving it."/J.J.C.Smart,Stanford Encyclopedia of Philosophy/
Nicholas of Cusa also advocated the doctrine of human's impossibility to reach the knowledge about "higher truths" as the metaphysical are. But when did he argue that?At the moment when he became very well learned.What do you mean?Are Pius X right when he spoke in favore of the reflection the faith and of needs to examination the revealed truths.