Abandon the essential and work hard on the small things.
It should be these:
Don't do good deeds because they are small, and don't do evil because they are small. And do it." (Liu Bei's teaching son)
"The accumulation of soil will form a mountain, and the accumulation of water will form a abyss."
"Those who cannot do small things cannot do big things." ——Lomonosov
“If you don’t sweep one house, how can you sweep the world?” ——Xue Qin