Nature gives you the face you have at twenty; it is up to you to merit the face you have at fifty.
To conceal anything from those to whom I am attached, is not in my nature. I can never close my lips where I have opened my heart.
Nature has planted in our minds an insatiable longing to see the truth.
Nature abhors annihilation.
Time destroys the speculation of men, but it confirms nature.
It is the nature of every person to error, but only the fool perseveres in error.
Nature does nothing in vain.
Love, in its own nature, demands the perfecting of the beloved.
Nature does nothing without purpose or uselessly.
It is of the nature of desire not to be satisfied, and most men live only for the gratification of it.
All human actions have one or more of these seven causes: chance, nature, compulsion, habit, reason, passion, and desire.
In all things of nature there is something of the marvelous.
Great men are always of a nature originally melancholy.
Nature does nothing uselessly.
All men by nature desire knowledge.
Look deep into nature, and then you will understand everything better.