Kempis

"He who learns to live the interior life and to take little account of outward things, does not seek special places or times to perform devout exercises. A spiritual man quickly recollects himself because he has never wasted his attention upon externals. No outside work, no business that cannot wait stands in his way. He adjusts himself to things as they happen. He whose disposition is well ordered cares nothing about the strange, perverse behavior of others, for a man is upset and distracted only in proportion as he engrosses himself in externals."

---- Kempis