Imagine there is a bank account that credits your account each morning with cash. It carries over no balance from day to day.
Every evening the bank deletes whatever part of the balance you failed to use during the day.
Each of us has such a bank. Its name is stock market.
Every morning, from 9.30am. To 2.30 pm. it credits you with cash.
At 2.30pm. It writes off as lost, whatever of this you have failed to invest.
It carries over no balance. It allows no over draft. Each day it opens a new account for you. Each evening it burns the remains of the day.
If you fail to use the day's deposits to gain profits, the loss is yours.
You must invest it so as to get something out of it.