Sin is always lurking at the door, isn't it? Especially pride.
Anyway, I decided to look through my box of letters from my Mom. She has this in quotes, but she doesn't give a reference (which is unusual for her but in her letter she mentions that she is rushing in a busy day):
He calls us not to self-indulgence, but to self-denial;
not to a frolic, but to a fight;
not to a picnic, but to a pilgrimage;
not to security, but to sacrifice;not to comfort, but to a cross.