Leonardo da Vinci: Necessity is the mistress and guardian of Nature .

Necessity is the mistress and guardian of Nature . — Leonardo da Vinci

Necessity is the mistress and guardian of Nature .

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It is always the under side of the branches of any plant that show themselves to — Leonardo da Vinci
Where there is most feeling, there is the greatest martyrdom. — Leonardo da Vinci
In order to prove whether the spirit can speak or not, it is necessary in the fi — Leonardo da Vinci
Those who fall in love with practice without science are like a sailor who enter — Leonardo da Vinci
Out of the book of Nature's learned breast. — Guillaume de Salluste Du Bartas
Ab interitu naturam abhorrere. — Nature abhors annihilation. Cicero
As in the eye of Nature he has lived, So in the eye of Nature let him die! — William Wordsworth
Nature never did betray The Heart that Loved her. — William Wordsworth
Do not fear failure but rather fear not trying. — Roy T. Bennett
He who is not sure of his memory, should not undertake the trade of lying. — Michel de Montaigne
A man who dares to waste one hour of time has not discovered the value of life. — Charles Darwin
The paths to the house I seek to make, But leave to those to come the house itse — Walt Whitman