No you don’t.
You do not need original ideas. You need powerful ones. Ideas that put you into a different context. Not ideas that make you look smart, but ideas that make you think. (Idea stolen from Alan Kay here)
How often have you seen the works of others and be surprised by their wit and ingenuity but when it is your turn to speak you lack the ideas and do not know what to say.
You think, their ideas are theirs, not mine.
In fact, you do not even have to try to answer our questions, just tell something that gets us to think. (Idea stolen from here)
Across all subjects, from chemistry, physics, philosophy and the arts you know way more than you often show, because you will not want to “blow your cover” and let others see that your ideas are in fact borrowed ideas. (Idea stolen from the old joke, “A consultant is someone who steals from the smart and sells to the stupid.”)
It is likely that you are in a powerful thinking context but you take it for granted. It is likely that it takes more time to put people into your context than you would like but do it anyways.
Show where you borrowed your ideas from, hide it. Once you have understood an idea, it’s yours. (Stolen from an essay of Montaigne)
Of course it would be ashamed to forget the identity of people who had great ideas before you but a detachment is needed anyways, and we should not attempt to judge an idea based on the authority of him who had it but by its merits. (Stolen from an email conversation with someone)
Most importantly, “blow your cover.” Risk stealing from the smart and selling to the stupid. (Stolen again from the old joke, “A consultant is someone who steals from the smart and sells to the stupid.”)