Allan Kardec. The book of spirits (№ 397580)

Question: since bodily life is only a temporary our stay, and our main concern should be the future, it is useful to try to acquire scientific knowledge concerning only objects and material needs?
A: Without a doubt; above all, it gives you the opportunity to help your brothers; then your spirit will rise soon, if he already has improved mentally. Between incarnations you in one hour, learn what would require several years on your land. No knowledge is not useless; they all contribute more or less improvement, because the spirit is perfect everyone should know, and as progress must be carried out comprehensively, all of the acquired knowledge contribute to the development of the spirit.