זוהר שמות — דף כז ע”א

Judah comes from the left side and cleaves to the right in order to overcome nations. If he does not cleave to the right, he cannot break the force of his enemies. The right awakens Kindness and the left awakens Judgments. The secret of victory lies in the union of left with right. All of Israel's strength comes from Kindness drawn from above.