The relationship between knowledge and practise in the Qur'an

In our age, it became very possible to reach the knowledge, as for religious knowledge, the same is true. However, the basic reason of social and political problems today is not the ignorance, but it is the knowledge that we have in theory; not in practice or in our behavior. In this study, we handle the knowledge according to Qur'an and the Sunnah, and the aim of it, and the importance of converting knowledge into the practice. Besides, we handle the consistency of word and practice which is quite related with knowledge and practice. We also mention here, the importance of the inconsistency between word and practice on children and young people. We also question here 'Should they declare the truth who don't follow it? Or Shouldn't they?' and in this study we have collected the ayats and hadiths which are linked to subject, and we have scanned tafsir and sharh sources, and to realize better we searched the academic works. As a result, the importance of relation between knowledge and practice is more important than we think, and we have realized that its outcomes in this world and here after is more crucial.