From newadvent.org:
Presumption
(Lat. praesumere, "to take before", "to take for granted").
Presumption is here considered as a vice opposed to the theological virtue of hope. It may also be regarded as a product of pride. It may be defined as the condition of a soul which, because of a badly regulated reliance on God's mercy and power, hopes for salvation without doing anything to deserve it, or for pardon of his sins without repenting of them. Presumption is said to offend against hope by excess, as despair by defect. It will be obvious, however, to one who ponders what is meant by hope, that this statement is not exact. There is only a certain analogy which justifies it. As a matter of fact we could not hope too much, assuming that it is really the supernatural habit which is in question.
Thanks.