The Holy Scripture may be learned by children as soon as they are capable of understanding anything. It is a very remarkable fact, which I have heard asserted by many teachers, that children will learn to read out of the Bible better than from any other book. I scarcely know why; it may, perhaps, be on account of the simplicity of the language, but I believe it is so. A biblical fact will often be grasped when an incident of common history is forgotten. There is an adaptation in the Bible for human beings of all ages, and therefore it has a fitness for children. We make a mistake when we think that we must begin with something else and lead up to the Scriptures. Parts of the Bible are above a child’s mind, for they are above the comprehension of the most advanced among us. There are depths in it in which leviathan may swim, but there are also brooks in which a lamb may wade. Wise teachers know how to lead their little ones into the green pastures beside the still waters. – Charles Spurgeon
Spurgeon Commentary: 2 Timothy, ed. Elliot Ritzema, Spurgeon Commentary Series (Bellingham, WA: Lexham Press, 2014), 219.