The Personality of Godhead is not a dead stone, nor is He inactive, as is poorly thought by some schools. He moves with the progress of time, and therefore lie knows all about the past and future, along with His present activities. There is nothing unknown to Him. The conditioned souls are driven by the reactions of the modes of material nature, which are the activities of the Lord. As stated in the Bhagavad-gita (7.12), the modes of nature act under His direction only, and as such no natural functions are blind or automatic. The power behind the activities is the supervision of the Lord, and thus the Lord is never inactive as is wrongly conceived. The Vedas say that the Supreme Lord has nothing to do personally, as is always the case with superiors, but everything is done by His direction. As it is said, not a blade of grass moves without His sanction. In the Brahma-samhita (5.48), it is said that all the universes and the heads of them (the Brahmas) exist only for the duration of His breathing period. The same is confirmed here. The air on which the universes and the planets within the universes exist is nothing but a bit of the breath of the unchallengeable virat-purusa. So even by studying the rivers, trees, air and passing ages, one can conceive of the Personality of Godhead without being misled by the formless conception of the Lord. In the Bhagavad-gita (12.5) it is stated that those who are much inclined to the formless conception of the Supreme Truth are more troubled than those who can intelligently conceive of the personal form.