According to Krishnamacharya , practice and knowledge must always go together. He used to say, practice without right knowledge of theory is blind. This is also because without right knowledge, one can mindfully do a wrong practice.
Study and practice are both very important, but they must go hand in hand. Faith without knowledge is not sufficient. Faith needs to be supported by reason. However intellectual understanding that is not applied in practice is also of little use. Whatever we learn from study we need to apply sincerely in our daily lives.
ARTLESSNESS, n. A certain engaging quality to which women attain by long study and severe practice upon the admiring male, who is pleased to fancy it resembles the candid simplicity of his young.
Life creeps slowly upward.... When some forgotten inventor of the older world smote his rival or enemy with a branch of wood and found that it was good and thereafter made a practice of smiting rivals and enemies with branches of wood, then, and on that day, artificiality may be said to have begun. Then, and on that day, was begun a revolution destined to change the history of life. Then, and on that day, was laid the cornerstone of that most tremendous of artifices, CIVILIZATION!
For decades, free nations tolerated oppression in the Middle East for the sake of stability. In practice, this approach brought little stability and much oppression, so I have changed this policy.
You say that you are too busy to meditate. Do you have time to breathe? Meditation is your breath. Why do you have time to breathe but not to meditate? Breathing is something vital to peoples lives. If you see that Dhamma practice is vital to your life, then you will feel that breathing and practising the Dhamma are equally important.
God's justice stands forever against the sinner in utter severity. The vague and tenuous hope that God is 'too kind' to punish the ungodly has become deadly opiate for the consciences of millions. It hushes their fears and allows them to practice all pleasant forms of iniquity while death draws everyday nearer and the command to repent goes unregarded. As responsible moral beings, we dare not so trifle with our eternal future.
If you desire to be pure, have firm faith, and slowly go on with your devotional practices without wasting your energy in useless scriptural discussions and arguments. Your little brain will otherwise be muddled.