God is faithful and rewards those who cling to & follow in His ways.  You will not only find rest by holding fast to the LORD, but you will find favour & wisdom.

Hezekiah was one of the last kings of Judah and the Bible says that God was with him and caused him to prosper... Why?  Because he held fast to His God.  He trusted, obeyed, clung to and followed the LORD.  (2 Kings 18:3-8)

...let me elaborate on the word 'prosper' so we can better understand.  In the original text the word prosper was used in the following context: to consider, instruct, be prudent, have skill, to teach, to understand, act & behave wisely, to comprehend, to discern, an expert, to gain insight, and give heed... (NAS Strong's Version)