Most new ideas can be stopped in their tracks by deploying one, or sometimes both, of two arguments: ‘the thin end of the wedge’ and ‘the time is not ripe’.

Hayden Phillips (1943- ), retired British civil servant, in The (London) Times earlier this month

It is on our failures that we base a new and different and better success.

Havelock Ellis (1859 – 1939), British doctor, writer and social reformer

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

Edward de Bono (1933- ), Maltese doctor, author and the inventor of “lateral thinking”