Should you share what you know & think with others? Of course you should. Doing so will in no way diminish what you have already; in fact, the chances are you will only enrich yourself further.
When you share with the spirit of helping others, you develop & grow yourself — this is the power of sharing. Because then, the universe shares with you. All successful people would admit that chance or luck also played a role.
The universe shares its bounty with you unconditionally. Does it look for gratitude or benefits in return? It has shared with you in the natural spirit of sharing. It has shared to help you. To make you happy. This is how one must share.
By sharing thus, you share as the universe has shared with you. This commonality brings you in the inner circle of the universe. Naturally as an inner circle member your share in the bounty of the universe increases.
Does a candle lose anything by lighting other candles? Apparently, it does. It is no longer the only torch in the neighbourhood. It seems to have lost its exclusivity. But this loss is temporary.
Moreover, this loss is minuscule in comparison to the gain that follows for this candle, by its being a part of a well-lit neighbourhood. Its solitude is now replaced by the camaraderie of torches around it. Its environs are now brightly illuminated. The loneliness is gone & it is time to celebrate. And this candle has the satisfaction of having made all this possible.
Remember, you cannot be truly wealthy till you share your wealth. Neale Donald Walsch, in Conversations with God , says: "A true master is not the one with the most students, but one who creates the most masters. A true leader is not the one with the most followers, but one who creates the most leaders. A true king is not the one with the most subjects, but the one who leads the most to royalty."
In fact, you can't receive without giving. Omanshu Sharma, a naturopath, tells me that you cannot inhale deeply unless you exhale strongly. This isn't just a logic that applies to the process of respiration. It is almost a cosmic cyclical law which governs all our transactions. Wealth creators all over the world know that money grows with circulation. This law governs not only the field of wealth but also that of ideas. This thought finds its echo in Gurjief's words when he says: "Whatever I shared is still mine, the rest I have lost."
The only rider here is that one can't share unless one has. And to have one needs to accumulate. So your accumulation & sharing should form a cycle. Accumulate-share-accumulate-share & so on. Deep expiration will create the necessary space in your being to accommodate the Universe's largesse.
I have heard about a corn farmer in Canada, who won all the quality awards, year after year. Researchers who went to study his methods & to check out what differentiated him from the other contestants were amazed by their findings. They found that he shared all his best practices with his neighbouring farmers.
When asked, why did he do so? He answered, "Because corn is a cross-pollination product. So it is important that the pollen grain coming to me from the neighbouring farms should be of good quality. It is for this reason that I share all my secrets with my neighbours. See how much I benefit."
So share. By sharing your wealth, your uniqueness will not be a casualty, it will, on the contrary, be the biggest beneficiary.