Any universe simple enough to be understood is too simple to produce a mind able to understand it.

Source: Tatoeba

Just as food feeds the body, so reading feeds the mind.

Source: Tatoeba

Follow your heart, not your fears.

Source: Tatoeba

Just as the body needs exercise, so the mind needs stimulation to stay healthy.

Source: Tatoeba

A blackboard had been covered with math equations, which the teacher was explaining, using a machete as a pointer. Above the blackboard was a motto, probably intended to be inspirational: "Studying and following Uncle Ho's words, our hearts are brighter!"

Source: Tatoeba

The mind should be a good servant, but the heart should be the master.

Source: Tatoeba

Optimism is like the lamp of hope. Pessimism [or negativity] is like a drug of sorrow.

Source: Tatoeba