$AZTEC The lesson humans can learn from history is that humans will never learn lessons from history. The principle of investing is actually very simple: buy low and sell high, wait patiently like a crocodile, and be patient. Use a long period of time to wait for that sudden explosion. For those of us who trade contract virtual currencies, it might be earning several years' worth of returns in just one day. Therefore, spending a lot of time waiting is totally worthwhile.