Humility is practical application of knowledge.
Theoretical knowledge can not touch heart without Humility
Knowledge means to know that I am helpless in this world and only the power of God can save me.
The purpose of all knowledge is to convince us that we should love Krishna.
One who disbelieves in the sastras [scriptures] is an atheist and we should not consult an atheist, however great he may be. A staunch believer in the sastras, with all their diversities, is the right person from whom to gather real knowledge. Such knowledge may seem inconceivable in the beginning, but when put forward by the proper authority its meaning is revealed and then one no longer has any doubts about it.
One can assimilate the knowledge of the revealed scriptures only by hearing and explaining.