"Wherefore, my beloved brethren [and sisters], I beseech of you in words of soberness that ye would repent and come with full purpose of heart, and cleave unto God as he cleaveth unto you.  And while his arm of mercy is extended towards you in the light of the day, harden not your hearts" (Jacob 6:5).
The word cleave means: to adhere firmly and closely or loyally and unwaveringly. So our Savior is cleaving unto us. He will stick to us loyally and always! And we need to stick to him loyally and always! No matter what! Even when we are trying to be good and do good bad things happens. And we all make mistakes and need to repent, every day. But if we cleave unto Him, He will always be there to help us, strengthen us, and love us!!! And, by sticking with Him, our hearts will not become hardened!