A farmer is the ideal example on how to trust in H'shem. The farmer readies his field and takes every measure to make sure his crop is successful all the while knowing it is only H'shem that will cause the crop to flourish or fail. 
pg 423
Nefesh Hachaim
Onkelos interprets Adams state after H'shem blew his spirit into him as a "speaking spirit" as speech is what sets us apart from all other forms of creation.
Gate Two, Chapter 14 pg 97