Investors should be skeptical of history-based models. Constructed by a nerdy-sounding priesthood using esoteric terms such as beta, gamma, sigma and the like, these models tend to look impressive. Too often, though, investors forget to examine the assumptions behind the models. Beware of geeks bearing formulas.
If you are going down a road and don't like what's in front of you, and look behind you and don't like what you see, get off the road. Create a new path!
The deeper we look, the more we shall be convinced that the one thing wanting, which we must strive to acquire before all others, is strength strength physical, strength mental, strength moral, but above all strength spiritual which is the one inexhaustible and imperishable source of all the others. If we have strength everything else will be added to us easily and naturally.