Learn to be a thanker rather than a complainer.
During the Israelites’ journey from Egypt they frequently grumbled, rebelled and on more than one occasion nearly stoned Moses. Even Moses and his brother Aaron, were stopped from going into the promised land because of their complaining.
Despite the amazing events of their escape from Egypt (where they had lived as slaves), the rich donations given by Egyptians, the crossing of the red sea, manna and quail literally from heaven, water from rocks and victories against armies who blocked their path, they still complained about the lack of food variety, how it had been more comfortable in the Egypt and why was Moses in charge.
Their complaining leads to God almost wiping them out in his anger, those left punished by being told that their generation will not enter the promised land, with 2 exceptions Caleb and Joshua.
Both these men had consistently reacted to the same difficulties that the others faced with trust in God rather than complaints.
Paul in his letters again and again tells us to be thankful, which is the opposite of complaining.
Yes there are examples of complaints against God in the Psalms, and our communication with God needs to be real and at times emotional.
In Dale Carnegie’s book How to make friends and influence people, he explains that complaining and critising may make us feel better but doesn’t have the desired effect on other people, people are not wired to react well to complaints. Having worked in customer service for many years I often found I reacted better to customers who didn’t negatively complain.
Christians like the Israelites have been set free from slavery, this time from slavery to sin. God blesses us again and again with his wisdom, with provision, with his hope, joy and peace and so many other things. So if we moan and critise and complain we are not living in the fruit of what God has given us, we are still harking back to Egypt.