The reason so many promises are not kept is the same as the reason they are made in the first place.

Plans made swiftly and intuitively are likely to have flaws. Plans made carefully and comprehensively are sure to.

Such self-transformation is the most difficult and dangerous challenge to the imagination, and it is the most rewarding. Meeting it is only possible for the person whose mind is open to contradictions and well-practiced in free conjecture.

The goal of discoverers is not to outdistance their peers, but to transcend themselves.

Free men and women... can think across time, viewing their own lives, inclusive of past, present, and future, as architectural wholes, static in mental space. They can therefore see, as others cannot, the cracks and buttresses of repeated action, the points of stress, the established framework. They are not perfect; but they are less imperfect than we by a full dimension of being.

At pains to define liberty, that most resolute of indefinables, our minds fall back on spatial images; on birds, sailboats, and mountains; the untethered balloon, the blue sky, the nude figure.

The limitation in our ability to perceive broad distinctions in scope can be applied to our moral and temporal responses.... We agonize over a dinner menu, or have engine trouble on the way to work; and for seconds or minutes our cosmos shrinks to a miniscule volume of being, an epic of cheese sauces or tragedy of fanbelts.