In other words where the mortgage is by way of charge, and not by conveyance, the mortgagee takes no estate whatsoever in the land or in the property but he has generally only an equitable interest to be enforced by sale upon an order of court. The equitable charge simpliciter only gives a right to payment out of the property; it does not amount to an agreement to give a legal mortgage at all. The strict mode of enforcing the charge is, however, by sale (or appointment of a receiver under an order of court) but never by foreclosure. On the other hand where, as here, the agreement is to create a legal mortgage when required following a default in the terms of the agreement, the agreement may be enforced according to its terms notwithstanding that the legal mortgage when executed will also confer on the mortgagee an immediate power of sale.
– Idigbe JSC. Ogundiani v. Araba (1978)