Because thou writest me often, I thank thee ... Never do I receive a letter from thee, but immediately we are together.
errare humanum est, sed perseverare diabolicum: 'to err is human, but to persist (in the mistake) is diabolical.
It is not because things are difficult that we do not dare; it is because we do not dare that things are difficult.
True happiness is to enjoy the present, without anxious dependence upon the future, not to amuse ourselves with either hopes or fears but to rest satisfied with what we have, which is sufficient, because it is from within."