Going by this message, one can learn that it is wisdom not to make promises, because sometimes we struggle to keep these promises, sometimes we never kept them. It is wisdom not to make promises.
You might promise something to a person, maybe along the line, something unexpected surfaces and you could not keep to your promises again. This can lead to disappointment and potentially causing minor hatred from person who expected the promise to be fulfilled. Some people might not understand your state at the moment, all they want is to see the promise being fulfilled.
To this reason, It is important not to make promise rather conceive it in mind to do what you would have promised and do it quietly without promising. That would be a surprise and create more love and comfort.
We know that as parent, we have higher responsibilities on taking care of our families. when it comes to injecting more happiness, make every gift a surprise and avoid promises. Promises most times seems very difficult to be kept.