Clive Staples Lewis was a British novelist, poet, academic, medievalist, literary critic and essayist. He held academic positions at both Oxford University and Cambridge University.

Known best for his fictional works, prominently "The Chronicles of Narnia", "The Screwtape Letters" and "The Space Trilogy", Lewis has also written several non-fiction apologetics such as "Mere Christanity", "Miracles" and "The Problem of Pain."

As the world celebrates the 117th birthday of the renowned author and humanitarian, here are some of his most popular quotes:

"You are never too old to set another goal or to dream a new dream."

"Integrity is doing the right thing, even when no one is watching."

"The task of the modern educator is not to cut down jungles, but to irrigate deserts."

"Failures, repeated failures, are finger posts on the road to achievement. One fails forward toward success."

"Look for yourself, and you will find in the long run only hatred, loneliness, despair, rage, ruin, and decay. But look for Christ, and you will find Him, and with Him everything else thrown in."

"I believe in Christianity as I believe that the sun has risen: not only because I see it, but because by it I see everything else."

"Miracles do not, in fact, break the laws of nature."

"Literature adds to reality, it does not simply describe it. It enriches the necessary competencies that daily life requires and provides; and in this respect, it irrigates the deserts that our lives have already become."

"Affection is responsible for nine-tenths of whatever solid and durable happiness there is in our lives."

"You can't get a cup of tea big enough or a book long enough to suit me."

"If you look for truth, you may find comfort in the end; if you look for comfort you will not get either comfort or truth only soft soap and wishful thinking to begin, and in the end, despair."