Leonardo da Vinci

I have offended God and mankind because my work didn't reach the quality it should have.

I love those who can smile in trouble, who can gather strength from distress, and grow brave by reflection. 'Tis the business of little minds to shrink, but they whose heart is firm, and whose conscience approves their conduct, will pursue their principles unto death.

Just as courage imperils life, fear protects it.

Life well spent is long.

As a well-spent day brings happy sleep, so a life well spent brings happy death.