First Commandment of Aserot HaDebrotSee Also Maimonides 13 principles of Faith. "Hu Kayam" (G-d Exists) is the first principle leading to ahavas Hashem (love of G-d) which is higher than fear of G-d (Yirat Shamayim). PA notes, "everything is in the hand of Hashem except fear of G-d, yirat Shamayim." See Also Library Guide "Ethical Monotheism"- Introduction by DBL which gives classic proofs for the existence of G-d i.e. (1) from motion, Hashem as 1st cause put the heavenly bodies in motion, (2) ontological proof, (Hashem is the thought beyond which thought cannot proceed), (3) proof from intelligent design, (4) proof from reliable tradition (masorah), (5) efficient cause proof, or proof from causality, (6) argument of necessary Being who is perfect, infinite, and self-sufficient, (7) argument from gradation i.e. clock suggests clock maker, (8) argument from moral conscience, ethical responsiblity and accountability before beit din memala, (9) credo absurdum ist, (10), universal consent.etc