correction of passage

Please help me by improving on the following:

It is impossible to understand the Daishonin's Buddhism by just reading the Goshos (= the Daishonin's writings) once or twice. We can deepen our understanding of the Daishonin's Buddhism gradually when we study it repeatedly and by having faith in the Gohonzon (= object of worship) and based our practice for oneself and others as our foundation and the guidance of our High Priest as our guiding principle. We must have a pure heart in order not to hold arrogance.

Many thanks.