Let all such fancies, illusive and destructive, be banished henceforward from your thoughts for ever. Resolve, and keep your resolution; choose, and pursue your choice. If you spend this day in study, you will find yourself still more able to study to-morrow; not that you are to expect that you shall at once obtain a complete victory. Depravity is not very easily overcome. Resolution will sometimes relax, and diligence will sometimes be interrupted; but let no accidental surprise or deviation, whether short or long, dispose you to despondency. Consider these failings as incident to all mankind. Begin again where you left off, and endeavour to avoid the seducements that prevailed over you before.
— Samuel Johnson to James Boswell (1763), quoted in Boswell’s Life of Johnson