Plain Facts for Old and Young by John Harvey Kellogg

1. For the beginning of a new life, select the most favorable time,

which will be when the bodily health is at its height; when the mind is free from care and anxiety; when the heart is joyous, cheerful, and filled with hope, love, high aspirations, pure and beautiful thoughts. If, as one writer says, it is the duty of every human pair engaging in the reproductive act to bring into existence the most perfect specimen of the race of which they are capable, then it becomes a monstrous crime to enter into relations which may produce a contrary result. This may be a truth hard to accept, but who is prepared to dispute it on logical or moral grounds?