The human intellect is the ...

The human intellect is the great truth-organ; realities, as they exist, are the subjects of its study; and knowledge is the result of its acquaintance with the things which it investigates.
The human intellect is the great truth-organ; realities, as they exist, are the subjects of its study; and knowledge is the result of its acquaintance with the things which it investigates.
 Moses Harvey

More phrases

Don't settle in the land of barely enough. That is where you are, it is not who you are. That's your location, it's not your identity. No matter what it looks like, have an abundant mentality.
The by-product is that they more people you help, the "richer" you become, mentally, emotionally, spiritually, and definitely financially.
 T. Harv Eker
Happiness doesn't depend on any external conditions, it is governed by our mental attitude.
The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is.
To improve is to change; to be perfect is to change often.

Quotes from the same author

We hail science as man's truest friend and noblest helper.
 Moses Harvey
Science is teaching man to know and reverence truth, and to believe that only so far as he knows and loves it can he live worthily on earth, and vindicate the dignity of his spirit.
 Moses Harvey