If population-growth went unchecked, he felt, "the damage to national efficiency might drive governments to act more intelligently"; but better would be "a concentrated drive for population-planning, despite the formidable practical, scientific and psychological obstacles". "Far more, however," he added, "depends on the individual and his power to realise his own plight. Hence the need for constant and frank discussion, instead of leaving the subject, as now, in a conspiracy of uneasy silence; and the need for patient and tireless propaganda against man's reckless propagation."