If the fundamentals of a business are good, we would invest in the business if we could, wouldn't we?
If the share price should see a decline but the fundamentals of the business remained intact, we should increase our investment in the business if we could, shouldn't we?
I am trying to make 2 points here:
1. Declining share prices give us an opportunity to buy more shares cheaper.
2. We should always have a war chest ready to take advantage of opportunities.
People who do not know what they are investing in might worry.
People who do not have a war chest ready might feel regret.
Do the right things, don't worry, don't regret.