No doubt Jack the Ripper excused himself on the grounds that it was human nature. – A.A. (Alan Alexandra) Milne

Difficulty is the excuse history never accepts. – Edward R. Murrow

To offer the complexities of life as an excuse for not addressing oneself to the simpler, more manageable (trivial) aspects of daily existence is a perversity often indulged in by artists, husbands, intellectuals — and critics of the Womens Movement. – Barbara Grizzuti Harrison

We excuse our sloth under the pretext of difficulty. – Marcus Fabius Quintilian