Doctrine of delay and laches bars relief where claimant's acquiescence and defendant's changed position make enforcement inequitable. The doctrine precludes equitable relief where two factors are satisfied: acquiescence-assent after the violation is complete and known to the claimant-and any change of position by the defendant. Relief is unjust if the claimant's conduct amounts to a waiver or has, through neglect, placed the defendant in a position making assertion of the remedy unreasonable; lapse of time and delay are therefore material.