By operation of the rule of estoppel a man is not allowed to blow hot and cold, to affirm at one time and deny at the other, or, as it is said, to approbate and reprobate. He cannot be allowed to mislead another person into believing in a state of affairs and then turning round to say to that person’s disadvantage that the state of affairs which he had represented does not exist at all or as represented by him.
– Nnaemeka-agu, JSC. Ude v. Nwara (1993)