No matter how good a car or its driver, if the car is not regularly checked, there will be problems. In the same way, if one moment I am happy but the next moment I am not, something is wrong with the vehicle of my mind and I will need to check it out.
Check the smoothness of its flow; is there purity? Has there been truth? What about ego versus self-generated respect? How much grief am I causing another? Where are my weaknesses? How can I grow?
Checking these regularly and keeping them in shape will deliver you to your destination. Carelessness in this will slow you down, like getting stuck in a storm. You will feel yourself in a rut.
So, instead, keep yourself tuned and ever-ready. Meditate at length, take power and love. Teach yourself how to be generous spirited and never stop giving.
