What I have known with respect to myself, has tended much to lessen both my admiration, and my contempt, of others. — Joseph Priestley. English chemist and polymath (1733–1804)
Will is nothing more than a particular case of the general doctrine of association of ideas, and therefore a perfectly mechanical thing.
In completing one discovery we never fail to get an imperfect knowledge of others of which we could have no idea before, so that we cannot solve one doubt without creating several new ones.
Could we have entered into the mind of Sir Isaac Newton, and have traced all the steps by which he produced his great works, we might see nothing very extraordinary in the process.