Exodus 23:29, 30 (NKJV)
I was born and raised in Wisconsin and Wisconsin gets a lot of snow in the wintertime. When it snows you have to change how you drive, the roads become slippery and caution is necessary. But sometimes people do not pay attention to the road conditions; they drive too fast and have problems. This is what is called driving too fast for conditions, someone was going too fast for the conditions they were driving in and that is why they had a problem. What is true naturally is also true spiritually; natural and spiritual development take time, getting in a hurry can lead to problems.
If we are going too fast, naturally or spiritually, we may miss some things along the way because we pass by them too quickly. Going too fast could mean that we find ourselves in a situation that we are not ready for or we might not take the time necessary to do something the way it really should be done. This is the same thing God was talking about in Exodus 23, there is only so much we can handle at a time and if we get going too fast we can end up with problems. God has a plan and purpose for our life but everything won't come to pass tomorrow.
Some people get in a rush in their relationship with God thinking that they start their life with God one day and become a spiritual giant the next day. Sometimes we try to move forward too fast and we do not take advantage of everything we are involved in at the moment and we miss an opportunity now we won't have later or we run into problems trying to deal with things we really aren't ready for. We need to realize that God knows what is best for us and allow Him to work with us and develop us at His pace, that way we will do everything the right way at the right time going exactly the right speed for the condition we are in.