Make not your thoughts your prison.

It is nonsense to say there is not enough time to be fully informed ... Time given to thought is the greatest timesaver of all.

The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.

Look sharply after your thoughts. They come unlooked for, like a new bird seen on your trees, and, if you turn to your usual task, disappear; and you shall never find that perception again; never, I say-but perhaps years, ages, and I know not what events and worlds may lie between you and its return.

Thought is the seed of action.

The glow of one warm thought is to me worth more than money.

Our life is what our thoughts make it.

Since it is seldom clear whether intellectual activity denotes a superior mode of being or a vital deficiency, opinion swings between considering intellect a privilege and seeing it as a handicap.

One thought fills immensity.

In itself, a thought, A slumbering thought, is capable of years, And curdles a long life into one hour.