Leonardo da Vinci
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.
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Don't look back. Something might be gaining on you...Nature will bear the closest inspection...Do not be anxious about tomorrow, for tomorrow will be...While all other sciences have advanced...That's what learning is, after all...It is easier to build strong children...