Our passions are joy and grief, love and hatred, hope and fear. Of joy and grief, the past is the object, and the future of hope and fear; even love and hatred respect the past, for the cause must have been before the effect.
 Samuel Johnson, The History of Rasselas, Prince of Abissinia (1759). copy citation

Context

“To judge rightly of the present, we must oppose it to the past; for all judgment is comparative, and of the future nothing can be known. The truth is that no mind is much employed upon the present; recollection and anticipation fill up almost all our moments. Our passions are joy and grief, love and hatred, hope and fear. Of joy and grief, the past is the object, and the future of hope and fear; even love and hatred respect the past, for the cause must have been before the effect. “ The present state of things is the consequence of the former; and it is natural to inquire what were the sources of the good that we enjoy, or the evils that we suffer. If we act only for ourselves, to neglect the study of history is not prudent.” source