Ibn Arabi's mystical and philosophical beliefs in knowing God, including the role of self-knowledge, intellect, heart and intuitive knowledge, etc., have influenced the beliefs of other mystics and philosophers, including Mulla Sadra. This research aims to examine the views of these two Islamic sages and philosophers, namely Ibn Arabi and Mullah Sadra, regarding the ways of acquiring the knowledge of God, and to explain the influence of Ibn Arabi's mysticism on Mullah Sadra's view of knowing God. The views of these two sages show that although Mulla Sadra was not an unequivocal follower of Ibn Arabi in many matters, they both believe in the knowledge of the Supreme Being in the three levels of nature, attributes, and actions, and they believe that human intelligence and existential capacities are abilities and capabilities. He does not understand the nature of God. Mulla Sadra, under the influence of Ibn Arabi, considers limits and boundaries for the intellect in knowing the Almighty and His Names and Attributes. Both Ibn Arabi and Mulla Sadra consider self-knowledge to be a very important way to know God, and in this regard, there is no difference between the two sages; Like Mulla Sadra, Ibn Arabi considers knowledge of God to be a matter of doubt, therefore, everyone is capable of knowing God according to his knowledge and cognitive ability.