When did Satoshi say that? Bitcoin was not designed to evade taxes, it was designed to give the user full control of their money. It is fair money, not magical tax free money. And the IRS has found that bitcoin solves their biggest problems with taxation by creating a perfect record of all transactions.  Bitcoin is taxed and in court the judge is not going to entertain your defense that "a guy on the internet said...".

First question is where you live at time of get and sell coins. Every country has different law.
If u gain profit by investing. This will be your capital gain.
If u get coin after job work that will be your income.
Different countries has different law on income tax. If it is taxable according to law then tax will apply.

I really do not know if the bitcoin is taxed in my country.

everything that make profit must have tax and this is our obligation being a people of nation and a followers of law,and besides its just small parts of the earning so why not give it for the government.

In the Philippines tax is not yet taxed on bitcoin but in other countries it has tax and we do not know how much tax it imposes. because maybe they know bitcoin as a business and they have it taxed. Whenever bitcoin is bought, sold, or traded, there are tax impacts. We'll discuss how bitcoins and other forms of virtual currency are taxed, and point out record keeping requirements and tax planning techniques that can be utilized.

Bitcoin can possibly taxable because we have earnings from trading until our coins were realised. In the Philippines, it is not yet taxable as the Government not yet know how to tax and what kind of rules and regulations should be implemented that does not violate the law of the state and to its people so I think until now they need to conduct further studies about it. The Government should implement taxable income to our earnings in trading in crypto currencies. But of course the investor will get affected on this tax however it will help them for their investments protection and safety so I think that would be ok if that's the case.

Bitcoin is taxed if we dilute our funds into the usd currency or else the exchangers usually withdraw fees and this is included with the tax. so bitcoin transactions have been taxed so far

Bitcoins are taxable and you have to pay taxes when you convert it to cash. If you don't pay taxes then you can get caught and you have to pay taxes then.
But most people don't pay taxes on Bitcoin.

In our country the tax on gains with bitcoin is 33%. I rather keep them than paying that.