Man of his word / Woman of his word: A person you can trust because s/he tells the truth and keeps promises.

http://idioms.thefreedictionary.com/a+man+of+his+word

When you believe in God and put your trust in him, you can stand on his promises.


From the song 'I Can See Clearly Now' by Jimmy Cliff:
"I can see clearly now the rain is gone....
Gone are the dark clouds that had me down,
It's gonna be a bright, bright sunshiney day."
http://youtu.be/KSuB4t3q_dA