Intro: The Lord knew how quickly man would forget God. Our present society is a testimony to that unfortunate fact. The Bible prophesied that in the last days, men would not even want to retain God in their knowledge. When Jesus went away, He left behind two ordinances, two object lessons to help us remember Him. He doesn't want us to forget Him. He wants us to be identified with Him always; therefore He gave us water baptism and communion.
I. HOW DOES WATER BAPTISM HELP US REMEMBER JESUS?
A. It follows His example. Matthew 3:13-17, "Then cometh Jesus from Galilee to Jordan unto John, to be baptized of him.  But John forbad him, saying, I have need to be baptized of thee, and comest thou to me?  And Jesus answering said unto him, Suffer it to be so now: for thus it becometh us to fulfil all righteousness. Then he suffered him.  And Jesus, when he was baptized, went up straightway out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him:  And lo a voice from heaven, saying, This is my beloved Son, in whom I am well pleased."
B. It obeys His command. Mark 16:16-17, "He that believeth and is baptized shall be saved; but he that believeth not shall be damned.  And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;"
C. It confesses Him before men. Matt. 10:32-33, "Whosoever therefore shall confess me before men, him will I confess also before my Father which is in heaven.  But whosoever shall deny me before men, him will I also deny before my Father which is in heaven."
D. It symbolizes the death of our old life and the beginning of our new life in Christ. Romans 6:1-6, "What shall we say then? Shall we continue in sin, that grace may abound?  God forbid. How shall we, that are dead to sin, live any longer therein?  Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?  Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.  For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection:  Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin."
II. HOW DOES COMMUNION HELP US REMEMBER JESUS?
A. It expresses our sharing the divine nature of our Lord. John 6:51-56, "I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.  The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?  Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.  Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.  For my flesh is meat indeed, and my blood is drink indeed.  He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him." 2 Peter 1:4, " Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust."
B. It is a memorial of His suffering and death. Communion will bring sickness and death to the body and damnation to the soul when it is taken irreverently by one living in sin. I Cor. 11:26-30, "For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come.  Wherefore whosoever shall eat this bread, and drink this cup of the Lord, unworthily, shall be guilty of the body and blood of the Lord.  But let a man examine himself, and so let him eat of that bread, and drink of that cup.  For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord's body.  For this cause many are weak and sickly among you, and many sleep."
C. It appropriates the benefits of Calvary for our healing. Communion will bring healing and life to the body when it is taken reverently by a Christian who is living free from sin. I Peter 2:21-24, "For even hereunto were ye called: because Christ also suffered for us, leaving us an example, that ye should follow his steps:  Who did no sin, neither was guile found in his mouth:  Who, when he was reviled, reviled not again; when he suffered, he threatened not; but committed himself to him that judgeth righteously:  Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness: by whose stripes ye were healed."