There's an anecdote from the time of the Prophet Muhammad's (peace be upon him) time which I think is related to this issue of reliance:
One day Prophet Muhammad (peace be upon him) noticed a Bedouin leaving his camel without tying it and he asked the Bedouin, "Why don't you tie down your camel?" The Bedouin answered, "I put my trust in Allah." The Prophet then said, "Tie your camel first, then put your trust in Allah" (At-Tirmidhi).
It makes clear that we have to use the means provided while at the same time having trust. We can't neglect either. They both have their place.
I hope I have explained myself clear enough. Feel free to ask if anything doesn't make sense.