Some day in the future, you will realize that the best time to invest was not today, but some other day in the future, when prices were low. But with the information that you have today, the best time to invest is still today, because you do not know when prices will be low, and you do know that the longer you hold your investment, the more time it has to grow.
Toughts?
In a way you are correct, since there is no point in worrying about what it was we need to worry about what we can do now, but at the same time you dont want to buy when the price is at the top because then it will be difficult to obtain any profits at all.