Purity of heart is an invalid excuse made from worldly desires; it is the way that people suppress their consciences that prevents most of them genuinely turning to Allah and that keeps them from abiding by the moral values commanded by Him.
1. Read the Quran with no purpose other than to receive guidance from your Lord, to come nearer to Him, and to seek His good pleasure.
What you get from the Quran depends on what you come to it for. Your intention and purpose is crucial. Certainly the Quran has come to guide you, but you may also go astray by reading it should you approach it for impure purposes and wrong motives.