Sentence:  So all-important are ideas , we are told , that persons successful in business and happy in social life usually fall into two classes : those who <WSD>invent</WSD> new ideas of their own , and those who borrow , beg , or steal from others . 
Meaning of the word marked with <WSD> tags:  come up with (an idea, plan, explanation, theory, or principle) after a mental effort