Jewish tradition and scientific reasoning provide two different and sometimes contradictory sources of truth, and Jewish thinkers throughout the ages have struggled to address these contradictions.
Some argue that the two are incompatible; we must reject either the Jewish tradition or science. Others strive to integrate the two by reading scientific theory into the Jewish tradition or understanding science in light of the Jewish tradition. Still others argue that the Jewish tradition and science cannot contradict each other because they serve two different purposes. While science explains how the world works, the Jewish tradition explores why the world works. Science describes the world, and the Jewish tradition prescribes how we should act in it.
The Bible and the Talmud did not see science as an opposing system of truth; rather, science and the Jewish tradition were understood to be two different manifestations of the same divine truth. The Bible embraced knowledge of the natural world as a means of knowing God. The Psalmist described the amazing natural phenomena that God created, and concluded, “How great are Your works, God. You made them all with wisdom” (Psalm 104).
The Rabbis of the Talmud saw science not only as a means of knowing God, but also as a necessary tool in halakhic (legal) decision making. The Talmud, for example, used detailed astronomical calculations in determining the Jewish calendar, but also asserted that these calculations provided insight into the divine mind. “He who knows how to calculate the cycles and planetary courses but does not, of him the Scripture says: ‘But they regard not the work of the Lord, neither have they considered His actions'” (Babylonian Talmud, Shabbat 75a).
The Talmud contains many references to scientific theories of its day, including many theories which have since been disproved. The Rabbis, for example, argued that one cannot break the Sabbath to help a woman in her eighth month give birth, because such a baby cannot be viable. Similarly, the Rabbis ruled that one can kill lice on the Sabbath because lice do not reproduce sexually.
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