"In entering the Buddha Dharma， there are generally three approaches: teaching， interpretation， and practice. Teachings are shallow， interpretation is profound， but practice is supreme （Master Ching-yin Hui-yan）."
"A scholar who studies and 'teaches' a sutra with the intent of footnoting and categorizing it， instead of practicing it， is like a starving man who， given food， puts it under a microscope instead of eats it， and who teaches others to starve with him. "
In Buddhism， regardless of the school followed， practice （cultivation） is a must. A Buddhist who merely studies or lectures on the Buddha's teaching while failing to put it into practice has been likened to a sick doctor who prescribes medicines for others while refusing to take any himself. According to Buddhist teachings， we all have within us varying degrees of greed， anger， and delusion. To practice is to avoid or mitigate the conditions that promote greed， anger， and delusion. Thus， for example， whenever anger flares up， one's thoughts should be redirected， as a form of displacement， toward the Buddha through Buddha-remembrance （Buddha Recitation）.
The cardinal rule of all Buddhist cultivation， regardless of tradition or school， is introspection--looking at your own mistakes and correcting them. To look at other people's shortcomings and criticize them is bound to disturb the mind and keep us in a perpetual state of anger and frustration.