The concept of God's greatness is a central belief in many religions and spiritual traditions. In some belief systems, God is considered to be all-powerful, all-knowing, and all-present, and therefore is greater than any earthly concept or experience.
In this context, it is possible to interpret the phrase "the highs and lows" as referring to the ups and downs of life, including moments of joy and success as well as times of hardship and struggle. From this perspective, it could be argued that God is indeed greater than the highs and lows, as God's power and presence are not limited by human experiences and circumstances.
However, the concept of God's greatness is a matter of faith and personal belief, and different people may have different understandings of what it means. Some may believe that God is greater than the highs and lows, while others may have a different perspective.