The Light shines on in the darkness, and the darkness did not understand it or overpower it or appropriate it or absorb it [and is unreceptive to it]. (John 1:5, AMP)
10 And therefore, he that will harden his heart, the same receiveth the lesser portion of the word; and he that will not harden his heart, to him is given the greater portion of the word, until it is given unto him to know the mysteries of God until he know them in full.
11 And they that will harden their hearts, to them is given the lesser portion of the word until they know nothing concerning his mysteries; and then they are taken captive by the devil, and led by his will down to destruction. Now this is what is meant by the chains of hell. (Alma 12)
For none of these iniquities come of the Lord; for he doeth that which is good among the children of men; and he doeth nothing save it be plain unto the children of men; and he inviteth them all to come unto him and partake of his goodness; and he denieth none that come unto him, black and white, bond and free, male and female; and he remembereth the heathen; and all are alike unto God, both Jew and Gentile. (2 Nephi 26:33)In light of God's word, it is clear that all truth is accessible to all people at all times.