In order to disprove the assertion that all crows are black, one white crow is sufficient.
If you want a confidence, act as if you already have it. Try the "as if" technique.
Let everything you do be done as if it makes a difference.
Impulse without reason is enough, and reason without impulse is a poor makeshift.
An educated memory depends on an organized system of associations; and its goodness depends on two of their peculiarities: first, on the persistency of the associations; and, second, on their number.
I will act as if I do make a difference.