One sees what one wants to see when there is in mind a pre-conceived notion.

A fervently believed idea, even if wrong, dies hard.

Disputes among natural philosophers are of use to science, as the quarrels of the great, and the clamors of the little, are necessary to freedom of thought and the advancement of learning.

I dig and plough at your command, ' I replied, 'but you will not tell me how to shit.

The mechanism of natural selection depends on the survival, not of the strongest, nor the most intelligent, but of the most adaptable.

Never before in our country's history has a generation been so empowered, so wealthy, so privileged - and yet so empty.

A person needs at intervals to separate himself from family and companions and go to new places. He must go without familiars in order to be open to influences, to change.

We must never forget what government is not. Government is not a philanthropic organization. Government is not the family. And government certainly is not the church.

The boat is safer anchored at the port; but that’s not the aim of boats.

Humility is to make a right estimate of one's self. It is no humility for a man to think less of himself than he ought, though it might rather puzzle him to do that.

Our best ideas come from clerks and stockboys.

If you think your organization needs a bigger marketing budget, maybe you just need to be less average instead.

Unwanted favours gain no gratitude.