We cannot just simply reason with ourselves that all is illusory; there are no karma, no Buddha and no sentient beings, so we don’t need to learn the Dharma either. Although the truth may be thus, our realization has not reached a level to warrant such reaction; just like everyone knows that dreams are unreal and no one likes having nightmares, but there is nothing one can do when the nightmare does come. Therefore, before attaining ultimate realization, we still must respect infallible karma and avoid suffering, notwithstanding their being illusory in reality. One cannot hope to resolve everything by simply telling oneself to let go, to not have attachment. The boat can only be abandoned after crossing the river. In order to cross to the other side of the river of samsara, one cannot give up the ship of practice just yet.

~Depicted from THE HANDBOOK FOR LIFE'S JOURNEY - On The Three Poisons-How to Refute Ignorance