Lacking in resolve

I really envy and admire people who have the Quran in their head i.e. memorise the Quran. To me, it is such a difficult thing to do that it's almost impossible but off course it is not. Thousands of people have done it, thousands are doing it and thousands more will do it. In my own little way, I have tried to join the thousands but I have not been been able to. I am still trying but the resolve is sometimes lacking. That's why I guess I am still at where I am even after so many years of trying.