Dear Lal,
This is what I have comprehended
Anicca- we cannot maintain any happiness to our complete satisfaction
Dukkha- due to this we experience dukkha in order to strive for that happiness in this samsara
Anatta- therefore we are helpless in this rebirth process
And also I have understood what you told, but the problem is that when I am contemplating on a Dhamma concept say as in Ariya Metta Bhavana “May myself and all living beings attain the Sōtapanna stage and be free from suffering in the apāyā forever”
“May myself and all living beings attain the Sakadāgāmi stage and be healthy forever”.
“May myself and all living beings attain the Anāgāmi stage and be content (attain peaceful happiness) forever”.
“May myself and all living beings attain the Arahant stage and be free from all suffering and attain the full Nibbānic bliss”., should I contemplate on this same thing for hours?