It's quite possible you underestimate your work or overestimate your abilities today. The phrase, Easier said than done, might seem all too true for tasks you thought would be a walk in the park. However, its more likely that even if you perfectly surmised what it would take to get things done, it still would be a test of your grit and stamina. Sometimes you must let the fire in your heart keep your hands warm while you do the cold, hard work ahead of you. Theres no other way around it. Its best to get on with your day with as much cheer as you can muster. Perseverance defines character.