Buffett had a good quote about it once that I can't find now, but essentially during most of your life you will be a net buyer of stocks. Only at the end, during your retirement, will you be a net seller and only then will you want high prices.
Until then, the less you pay for your stock purchases, the better your long term gains will be.
Until then, the less you pay for your stock purchases, the better your long term gains will be.