Natural law itself is actually brought openly in the gemara. It forms the basic of the debate between the sages and R Shimon ben Yochai if we go by the reason for the commandment or by the literal meaning. [See e.g. Bava Metzia page 119.] So everyone agrees there is a known and rational reason for every commandment except for the red heifer.
Belief in God is rational. Everything has a cause. So unless there is a first cause, then you would have an infinite regress. And then nothing could exist. Therefore there must be a first cause. Therefore God, the first cause, exists. QED.
26.9.19
Natural law itself is actually brought openly in the gemara.
Natural law itself is actually brought openly in the gemara. It forms the basic of the debate between the sages and R Shimon ben Yochai if we go by the reason for the commandment or by the literal meaning. [See e.g. Bava Metzia page 119.] So everyone agrees there is a known and rational reason for every commandment except for the red heifer.