~snip~
If you are disciplined enough to know that greed will get you nowhere then you can be sure that you will be safe from possible let downs. One thing that I do believe a trader should possess is being content, content with what profits that he/she reaped and not minding the continuous price climb because he/she knows that the profit was enough. Market will not always be high, there will be lows and no one knows when is the low happening so you better get that profits before the low times come and you will waste another year waiting for another high.
Feeling satisfied is something that sometimes, we forgot because we want more and more without thinking that it is enough for us. We should know when we should have enough with what we got, and as you say, the market will be down, and if we can feel satisfied with the result before, we will stop for a while and wait for the next things that can happen to the market. There will be another moment for us to enter the market at the right time, and we will have another chance to buy low and sell high. It is better to feel enough than to chase something that we don't know if we can get or not.