“He who hasn’t tasted bitter things hasn’t earned sweet things.”

Indeed in general I hold that there is nothing truer than happiness, and nothing happier and sweeter than truth.

To love is to place happiness in the heart of another.

It is necessary to believe that the mixture of evil has produced the greatest possible good: otherwise the evil would not have been permitted.

The present is saturated with the past and pregnant with the future.

What is is what must be.

Justice is charity in accordance with wisdom.

To love is to be delighted by the happiness of someone, or to experience pleasure upon the happiness of another. I define this as true love.

I hold that it is only when we can prove everything we assert that we understand perfectly the thing under consideration.

I do not conceive of any reality at all as without genuine unity.

Nature does not make leaps.

Taking mathematics from the beginning of the world to the time when Newton lived, what he had done was much the better half.

Nothing is necessitated whose opposite is possible.

Every substance is as a world apart, independent of everything else except God.

We never have a full demonstration, although there is always an underlying reason for the truth, even if it is only perfectly understood by God, who alone penetrated the infinite series in one stroke of the mind.

The present is big with the future, the future might be read in the past, the distant is expressed in the near.

Nothing is more important than to see the sources of invention which are, in my opinion more interesting than the inventions themselves.

Heart is capable of so much more than just anger and bitterness.  

Nothing is so bitter that a calm mind cannot find comfort in it.

Those who cannot work with their hearts achieve but a hollow, half-hearted success that breeds bitterness all around.

By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.

Patience is bitter, but its fruit is sweet.

Let us not seek to satisfy our thirst for freedom by drinking from the cup of bitterness and hatred.

Bitterness is like cancer. It eats upon the host. But anger is like fire. It burns it all clean.

The roots of education are bitter, but the fruit is sweet.