Like the wisps of clouds crossing the sky in ever changing shapes and densities, so are our thoughts in our mind. For this reason, the Buddha has said, do not become attached.
Every day we are a new being. Therefore, do not cling to who you were yesterday, or five days ago, or five years ago. Do not cling to who you might be in the future.
Seek the clear sky beyond the drifting clouds, and embrace the fullness of who you are.