Yes, I agree with this statement.
One of the important and major source of public revenue is the tax revenue. A tax is a compulsory payment made by the citizens of the country to the government without any direct quid pro-quo. It implies that a tax has to be paid by all people and it does not involve any corresponding obligation on the part of the government i.e., government need not repay anything.
Taxes are of two types:
(1) Direct Tax
(2) Indirect Tax.