“At that time, I (Moses) pleaded with God.” Moses knew a special way of prayer that is delivered directly, through the passageway we've described before. “But God had turned Himself against me because of you.”
As is known, Moses has moments of immaturity and maturity. This is also true for all souls, and in this they are similar to Zeir Anpin, the Spiritual Man, who passes through the stages of pregnancy, youth (immaturity) and wisdom (maturity).
God gives wisdom to the true leaders of the generation, but only in accordance with the merits of the generation. When the generation of the desert worshiped the Golden Calf, they caused Moses to regress and go from maturity back to immaturity and further into the state before being born. He lost all the Lights of Wisdom that he previously possessed, and returned to his immature youth. The state of before-being-born of Zeir Anpin is in the womb of Ima Ilaa, the Supernal Mother. That is the secret of the phrase, “But God turned Himself (vayitaber) against me,” literally, “made me return to my pregnant mother.” For just as the wrongdoings of the generation cause Zeir Anpin (the spiritual sum of the humanity) to regress and return to immaturity, so too it applies to the leaders of the generation.
Art: Paul Gavarni - Pregnant woman with her mother