Unless the child, in his earliest years, be carefully tended, whether in a material or a spiritual sense, whether as to his physical health or his education, it will prove extremely difficult to effect any changes later on. For example, if a child is not properly cared for at the beginning of life, so that he doth not develop a sound body and his constitution doth not flourish as it ought, his body will remain feeble, and whatever is done afterward will take little effect. This matter of protecting the health of the child is essential, for sound health leadeth to the strengthening of insight and sense perception, and then the child, as he learneth sciences, arts, skills, and the civilities of life, will duly develop his powers....
- ‘Abdu’l-Baha (From a Tablet; Additional Tablets, Extracts and Talks; online Baha’i Reference Library of the Baha’i World Center)