Exodus 19:16  says, And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that was in the camp trembled.  On the third day, when God had said He would appear to the people of Israel, there was thunder and lightning, and a thick cloud on the mountain, which could have been explained as just a weather phenomenon, until the trumpet sounded exceedingly loud,  When God does appear to us, as followers of Christ, we cannot explain it away as just some natural occurrence, even if we don't hear a trumpet sound.  Even if God speaks to us in a still, small voice, we will still know that it is Him if we are only listening.  The people were afraid, but we do not need to be afraid when God speaks to us today if we have accepted Christ as our Savior and Lord.  Verse seventeen states,  And Moses brought forth the people out of the camp to meet with God; and they stood at the nether part of the mount.  Moses brought the people of Israel out to meet God, and they stood at the foot of the mountain.  We today bring people to meet Christ, and they stand at the foot of the cross.  Until this point, even though they were God's chosen people, God was only speaking to them through Moses, who relayed God's words to them.  Until a person encounters God in a personal relationship, they may need someone else to share His word with them, though He will be calling them to come.  Verse eighteen declares, And mount Sinai was altogether on a smoke, because the LORD descended upon it in fire: and the smoke thereof ascended as the smoke of a furnace, and the whole mount quaked greatly.  The whole mountain was covered with smoke and quaked at the presence of God.  I believe that when God really makes Himself known that He cannot be ignored and we will know beyond a doubt that it is God.  God told Moses in advance that He was going to appear, just as He has told us in advance that one day Christ is going to reappear.  We sometimes want to claim that natural disasters are God's punishment, especially if they don't happen to us, but I believe that if God sends His punishment that there will be no other possible explanation for what happens.  Verse nineteen adds, And when the voice of the trumpet sounded long, and waxed louder and louder, Moses spake, and God answered him by a voice.  As the trumpet ot louder and sounded longer, Moses spoke out loud to God,  Once God gets our attention today, we need to respond to Him, though we might not need to speak out loud.  Verses twenty declares, And the LORD came down upon mount Sinai, on the top of the mount: and the LORD called Moses up to the top of the mount; and Moses went up.  God came down to the top of the mountain and called Moses up.  Just as God was above Moses then and called Moses up to Him, so He is above us today and comes down and calls us up to Him.  We cannot reach God by our own abilities, but can only respond when He comes down to us and calls us to Him.  Verse twenty-one adds, And the LORD said unto Moses, Go down, charge the people, lest they break through unto the LORD to gaze, and many of them perish.  God told Moses to go down and tell the people not to come up simply because of curiosity.  Some people today want to try to come to God on their own terms, but it will not work.  Verse twenty-two continues, And let the priests also, which come near to the LORD, sanctify themselves, lest the LORD break forth upon them.  The priests who were to come near to God were to sanctify themselves, just as we as a priesthood of believers should do today.  Verse twenty-three says, And Moses said unto the LORD, The people cannot come up to mount Sinai: for thou chargedst us, saying, Set bounds about the mount, and sanctify it.  Moses told God that the people could not come up because God had set bounds.  We today cannot come to God except through faith in Christ, which is the bounds that God has set for salvation.  Until we accept Christ, we will remain at the foot of the mountain and never know God in a personal relationship.  Verse twenty-four proclaims, And the LORD said unto him, Away, get thee down, and thou shalt come up, thou, and Aaron with thee: but let not the priests and the people break through to come up unto the LORD, lest he break forth upon them.  Only Moses and Aaron were allowed to go up the mountain to meet with God.  Thankfully, anyone today who will respond to Christ in faith is able to enter into a personal relationship with God.  Verse twenty-five states, So Moses went down unto the people, and spake unto them.  Moses did what God told him to do, and so must we today as Christians,