The third great defect of our civilization is that it does not know what to do with its knowledge. Science has given us powers fit for the gods, yet we use them as small children. For example, we do not know how to manage our machines. Machines were made to be humanity's servants, yet man has grown so dependent on them that they are in a fair way to become his masters. Already most people spend most of their lives looking after and waiting upon machines. And the machines are very stern masters. They must be kept at the right temperature. And if they do not get their meals when they expect them, they grow sulky and refuse to work or burst with rage and blow up and spread ruin and destruction all around. So we have to wait upon them very attentively and do all that we can to keep them in a good temper. Already we find it difficult either to work or play without the machines, and time may come when they will rule us altogether, just as we rule the animals. And this brings me to the point at which I asked, “What do we do with all the time which the machines have saved for us, and the new energy they have given us?" On the whole, it must be admitted, we do very little. For the most part, we use our time and energy to make more and better machines which will give us still more time and still more energy, and what are we to do with them? The answer, I think, is that we should try to become more civilized. For the machines themselves, and the power which the machines have given us, are not civilization but aids to civilization. But you will remember that we agreed at the beginning that being civilized meant making and linking beautiful things, thinking freely and living rightly and maintaining justice equally among people. A person has a better chance today to do these things than he/she ever had before; he/she has more time, more energy, less to fear and less to fight against. If he/she will give his/her time and energy which his/her machines have won for him/her to make more beautiful things, to find out more and more about the universe, to remove the cause of quarrels between nations, to discover how to prevent poverty, then I think our civilization would undoubtedly be the greater as it would be more lasting than it has ever been. The general tone of the passage is

The third great defect of our civilization is that it does not know what to do with its knowledge. Science has given us powers fit for the gods, yet we use them as small children. For example, we do not know how to manage our machines. Machines were made to be humanity's servants, yet man has grown so dependent on them that they are in a fair way to become his masters. Already most people spend most of their lives looking after and waiting upon machines. And the machines are very stern masters. They must be kept at the right temperature. And if they do not get their meals when they expect them, they grow sulky and refuse to work or burst with rage and blow up and spread ruin and destruction all around. So we have to wait upon them very attentively and do all that we can to keep them in a good temper. Already we find it difficult either to work or play without the machines, and time may come when they will rule us altogether, just as we rule the animals. And this brings me to the point at which I asked, “What do we do with all the time which the machines have saved for us, and the new energy they have given us?" On the whole, it must be admitted, we do very little. For the most part, we use our time and energy to make more and better machines which will give us still more time and still more energy, and what are we to do with them? The answer, I think, is that we should try to become more civilized. For the machines themselves, and the power which the machines have given us, are not civilization but aids to civilization. But you will remember that we agreed at the beginning that being civilized meant making and linking beautiful things, thinking freely and living rightly and maintaining justice equally among people. A person has a better chance today to do these things than he/she ever had before; he/she has more time, more energy, less to fear and less to fight against. If he/she will give his/her time and energy which his/her machines have won for him/her to make more beautiful things, to find out more and more about the universe, to remove the cause of quarrels between nations, to discover how to prevent poverty, then I think our civilization would undoubtedly be the greater as it would be more lasting than it has ever been. The general tone of the passage is