Of course we have free will because we have no choice but to have it.
Only a humorless tyrant could want a perpetual chanting of praises that, one has no choice but to assume, would be the innate virtues and splendors furnished him by his creator, infinite regression, drowned in praise!
If we have free will, by definition we cannot be granted it. We can't be given it. My [-audio-recording-distorted-] paradox states that 'Of course we have free will, we have no choice.' To say that it's a gift is to negate the whole concept of free will on its face. So, if that isn't self-evident, I can't think of anything that would meet the definition of being self-evident.