Edith Eger who is a holocaust survivor and psychologist said in her book the choice:
” To be free is to live in the present. If we are stuck in the past, saying, “If only I had gone there instead of here …” or “If only I had married someone else …,” we are living in a prison of our own making. Likewise if we spend our time in the future, saying, “I won’t be happy until I graduate …” or “I won’t be happy until I find the right person.” The only place where we can exercise our freedom of choice is in the present.”
The present is all we ever have. And that’s where true freedom and happiness are found.