Small pills

Every worthwhile blog devotes some highly visible space to place quotes from more or less famous personalities. We could not be any less. But as we mathematicians like to play and are somewhat crooked -almost all of us-, we will incorporate all kinds of pills here: some will be poisonous and bitter, others sweet; it will be difficult to swallow more than one and others will go down like a pinch of pure ambrosia. Some will be just a placebo and others, we hope, will bring relief and recovery.