The spark from a tiny star can ignite the plains. -- Chairman Mao
When there are duties to perform [true] servants and sons serve their labors.
(Meaning when in need, true servants come to the aid of their masters; when in need, true sons come to the aid of their fathers)
星星之火，可以燎原 -- 毛主席
有事弟子服其勞 -- 孔子