For the happiest life, days should be rigorously planned, nights left open to chance.
— Mignon McLaughlin

Thus, in a sense, mathematics has been most advanced by those who distinguished themselves by intuition rather than by rigorous proofs.
Felix Klein rigorous quote

If this work seems so threatening, this is because it isn't simply eccentric or strange, but competent, rigorously argued, and carrying conviction.
— Jacques Derrida

Within psychology and neuroscience, some new and rigorous experimental paradigms for studying consciousness have helped it begin to overcome the stigma that has been attached to the topic for most of this century.
— David Chalmers

We are endeavoring, too, to reduce the government to the practice of a rigorous economy, to avoid burdening the people, and arming the magistrate with a patronage of money, which might be used to corrupt and undermine the principles of our government.
— Thomas Jefferson