If there is an express provision making time of the essence of the contract, full effect must be given to it.1 Thus a provision and express condition that in case of failure of the vendee to perform, the vendor should have the right to declare the contract void makes time of the essence.2 So if time is not originally of the essence of the contract, but after default the promisee gives notice fixing a reasonable time for performance, and insisting upon performance within that time, time may become of the essence of the contract.3 However if time is not originally of the essence of the contract, a notice given by one party before performance is due cannot make it of the essence.4