Having a grateful heart is a tool for your mind.
Praise to God is our weapon against the enemy.
v.15b "...the children cried in the temple, and saying, Hosanna to the son of David;..."
v.16 "Yea, have ye never read, Out of the mouth of babes and sucklings thou hast perfected praise?"
In everything give thanks; for this is the will of God in Christ Jesus concerning you."
"I exhort therefore, that, first of all, supplications, prayers, intercessions, and giving of thanks, be made for all men; For kings, and for all that are in authority; that we may lead a quiet and peaceable life in all godliness and honesty. For this is good and acceptable in the sight of God our Savior;
Give thanks and praise no matter what.
Praise drives out fear. It produces a grateful heart. Praise is built upon faith. and God honors faith.
Praising God refreshes the spirit and soul.
When we complain, we build on doubt and unbelieve. Doubt will hinder our praise but praise defeats unbelieve.
"And He did not many mighty works there because of their unbelief."