From the Notebooks — Leonardo da Vinci
As a well-spent day brings happy sleep, so a life well used brings happy death. Iron rusts from disuse; stagnant water loses its purity and in cold freezes: even so does inaction sap the vigour of the
As a well-spent day brings happy sleep, so a life well used brings happy death. Iron rusts from disuse; stagnant water loses its purity and in cold freezes: even so does inaction sap the vigour of the mind. Learning never exhausts the mind. Nothing strengthens authority so much as silence. The noblest pleasure is the joy of understanding.