Hope and the ripple effect

From Here is Where We Meet by John Berger.

Berger and his mother are in conversation about many things, including the nature of hope. A dog barks in the background. His mother says:

"Let's hope only for what has some chance of being achieved! Let a few things be repaired. A few is a lot. One thing repaired changes a thousand others....The dog down there is on too short a chain. Change it, lengthen it. Then he'll be able to reach the shade, and he'll lie down and he'll stop barking. And the silence will remind the mother she wanted a canary in a cage in the kitchen. And when the canary sings, she'll do more ironing. And the father's shoulders in a freshly ironed shirt will ache less when he goes to work. And so when he comes home he'll sometimes joke, like he used to, with his teenage daughter. And the daughter will change her mind and decide, just this once, to bring her lover home one evening. And on another evening, the father will propose to the young man that they go fishing together...Who in the world knows? Just lengthen the chain."