If you love what you are doing, you will be successful.

An optimist is a person who sees a green light everywhere, while a pessimist sees only the red stoplight... the truly wise person is colorblind.

That's my private ant. You're liable to break its legs.

Kindness works simply and perseveringly; it produces no strained relations which prejudice its working; strained relations which already exist it relaxes. Mistrust and misunderstanding it puts to flight, and it strengthens itself by calling forth answering kindness. Hence it is the furthest reaching and the most effective of all forces.

You must learn to understand the secret of gratitude. It is more than just so-called virtue. It is revealed to you as a mysterious law of existence. In obedience to it we have to fulfill our destiny.

In case my life should end with the cannibals, I hope they will write on my tombstone, 'We have eaten Dr. Schweitzer. He was good to the end.'

No ray of sunlight is ever lost, but the green which it awakes into existence needs time to sprout, and it is not always granted to the sower to see the harvest. All work that is worth anything is done in faith.