So-called "inspiration" is no more than an extreme example of a process which constantly goes on in the minds of all of us.
Anthony StorrThe word "jealousy" is often used as if it were synonymous with envy; but I think the distinction worth preserving. Jealousy is predominantly concerned with the fear of loss of something one possesses, envy with the wish to own something another possesses. Othello suffers from the fear that he has lost Desdemona's love. Iago suffers from envy of the position held by Cassio, to which he feels entitled.
Anthony StorrIf we did not look to marriage as the principal source of happiness, fewer marriages would end in tears.
Anthony Storr