Only by conquering oneself can one conquer all.

Anyone who has achieved success is a person of very strict self-discipline. Whether in worldly matters or in the Buddhadharma, only through self-discipline can one achieve success and transcend oneself. The accomplishment of selflessness surpasses everything and can bring all endeavors to fruition. Conversely, a person with a sense of self is petty and calculating everywhere, small-minded, tolerant of themselves but intolerant of others, and it is very difficult for such a person to accomplish anything. As long as everyone works selflessly and selflessly for Buddhism with an undivided mind, the merit thus gained is considerable, and from this merit will come very great wisdom and liberation. Those who do not take part in propagating the Dharma simply cannot compare. 

It is perfectly fine for each person to struggle against their own selfishness; there is absolutely no problem in struggling against one's own greed; it is perfectly fine to struggle against one's own hatred; there is absolutely no problem in struggling against one's own jealousy; it is perfectly fine to struggle against one's own mind of gossip and disputes over people; there is absolutely no problem in struggling against one's own mind of scrambling for power and profit. In short, struggling against oneself, fighting oneself, is completely fine. Just do not fight against others, do not contend with others. When matters of fame and profit arise, you may avoid them—do not stick your head out, do not fight, snatch, seize, or steal, and do not harm the interests of others. Only take on responsibilities; do not compete for rights and benefits.