Yogi bhajan
"Old age, mental old age, and spiritual instability often beset us because we do not stretch ourselves when we get up. Stiffness in the body is not the way. It can make the body old and brittle even at a young age and it can make the mind's mischief intolerable to the point of insanity at any age." Yogi Bhajan What is he saying by minds mischief to the point of insanity"