śakteḥ śivasya ca paraṁ
yat tad brahma nirantaram
Although Lord Brahmā had received very respectful obeisances from Lord Śiva, he knew that Lord Śiva was in a more exalted position than himself. Lord Śiva’s position is described in Brahma-saṁhitā: there is no difference between Lord Viṣṇu and Lord Śiva in their original positions, but still Lord Śiva is different from Lord Viṣṇu. The example is given that the milk in yogurt is not different from the original milk from which it was made.