Vice came in always at the door of necessity, not at the door of inclination.

-Defoe, Daniel
  Moll Flanders.

If I am to disclose to you what I should prefer if I follow theinclinationof mynature,it isthis: beggar-womanand single, far rather than queen and married!

-Elizabeth I
   Attributed reply to an imperial envoy. Quoted in  J E Neale Queen Elizabeth I (1979).

I put for a general inclination of all mankind, a perpetual and restless desire of power after power, that ceaseth only in death.

-Hobbes,Thomas
Leviathan, pt.1, ch.11.

A man ought to read just as inclination leads him; for what he reads as a task will do him little good.

-Johnson, Samuel known as Dr Johnson
  Remark,14  Jul. Quoted in  James Boswell The Life of Samuel Johnson (1791), vol.1.

There is a wicked inclination in most people to suppose anoldmandecayed inhisintellects.Ifayoungor middle- aged man, when leaving a company, does not recollect where he laid his hat, it is nothing; but if the same inattention is discovered inanold man, people will shrug up their shoulders, and say,'His memory isgoing.'

-Johnson, Samuel known as Dr Johnson
  Quoted in  James Boswell The Life of Samuel Johnson (1791), vol.4.

Wer richtig r a« sonniert, erfindet auch; und wer erfinden will, muss r a« sonnieren k o« nnen. Nur die glauben, dass sich das eine von dem anderen trennen lasse, die zu keinem von beiden aufgelegt sind. The man who can reason properly can invent; and anyone who wants to invent must be able to reason. The only people who think that the one can be separated from the other are those who have no inclination for either.

-Lessing, Gotthold Ephraim
  Hamburgische Dramaturgie.

If your daughters are inclined to love reading, do not check their inclination by hindering them of the diverting part of it. It is as necessary for the amusement of women as the reputation of men; but teach them not to expect anyapplause from it† Ignorance is as much the fountain of vice as idleness, and indeed generally produces it. People that do not read or work for a livelihood have many hours they know not how to employ, especially women, who commonly fall into vapours or something worse.

-Montagu, Lady Mary Wortley ne¤  e Pierrepoint
  Letter,  Jan. Collected in R Halsband (ed) Selected Letters of Lady Mary  Wortley Montagu (1970).