Subjective idealism regards the subjective spirit (human feelings, experiences, ideas, wills, etc. ) as the only true existence and the origin of the world, objective things and even the entire material world are the products of this subjective spirit. Which of the following views belongs to subjective idealism? ['The essence of the world is matter.', 'The world is the product of absolute spirit.', 'Destiny dominates the human world.', 'I think, therefore I am.']