(At the request of MaiteMarie)
An English children's writer, who you may know from her Noddy and Famous Five series.

"Leave something for someone but don't leave someone for something." 

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"You're trying to escape from your difficulties, and there never is any escape from difficulties, never. They have to be faced and fought." 

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"If you can't look after something in your care, you have no right to keep it." 

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"The best way to treat obstacles is to use them as stepping-stones. Laugh at them, tread on them, and let them lead you to something better." 

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"Hatred is so much easier to win than love - and so much harder to get rid of." 

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"The point is not that I don't recognise bad people when I see them — I grant you I may quite well be taken in by them — the point is that I know a good person when I see one." 

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"It wasn't a bit of good fighting grown-ups. They could do exactly as they liked." 

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"When you're paid to do a job, it's better to give a few minutes more to it, than a few minutes less. That's one of the differences between doing a job honestly and doing it dishonestly! See?" 

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"There's a rainbow around every corner is a well known saying and is supposed to make negative people positive." 

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"A clown needn't be the same out of the ring as he has to be when he's in it. If you look at photographs of clowns when they're just being ordinary men, they've got quite sad faces."