The birth anniversary of India's second President Dr Sarvepalli Radhakrishnan is celebrated as National Teachers' Day.Here are some inspirational quotes by Dr Sarvepalli Radhakrishnan: When we think we know we cease to learn The true teachers are those who help us think for ourselves Books are the means by which we build bridges between cultures Teachers should be the best mind in the country All our world organizations will prove ineffective if the truth that love is stronger than hate does not inspire them Knowledge gives us power, love gives us the fullness Human life as we have it is only the raw material for Human life as it might be It is said that a man without religion is like a horse without bridle A life of joy and happiness is possible only on the basis of knowledge and science It is not God that is worshipped but the authority that claims to speak in His name. Sin becomes disobedience to authority not violation of integrity. To look upon life as an evil and treat the world as delusion is sheer ingratitude Religion is the conquest of fear; the antidote to failure and death