"In the selfsame day, as God had said unto him." (Gen. 17:23)

Instant obedience is the only kind of obedience there is; delayed obedience is disobedience. Every time God calls us to any duty, He is offering to make a covenant with us; doing the duty is our part, and He will do His part in special blessing.

The only way we can obey is to obey "in the selfsame day," as Abraham did. To be sure, we often postpone a duty and then later on do it as fully as we can. It is better to do this than not to do it at all. But it is then, at the best, only a crippled, disfigured, half-way sort of duty-doing; and a postponed duty never can bring the full blessing that God intended, and tha............