The process of validation of truth.

The cause and effect is the truth. How do I validate it? and then how do I practice it?

So it is coming from Buddha, a very trustworthy source, Does it make sense intellectually, A tree is born out of the seed and produces more seed if there is anything exist there has to be the cause behind it. now you look at different things and you analyse there cause. Tree exist because there is a seed and right conditions. laptop exist because someone thought about it and then put energy behind it, I believe in true love because I heard from someone and believe it. now you try to prove it wrong. with intellect, I can come up with different reasoning then you need to see through observation.

There is a thought and then there is another similar thought action on last thought is the cause of the next thought.

There is a tendency to quickly jump to the conclusion. If you want to truly understand something then you must be willing to stay with the thought and endure the process of patiently waiting for the answer.

Once you understand it how will you practice it? Experiential understanding itself has a lot of weight. From some understanding, the action originates and you can decide or change the meaning of that action with the force of will. You can replace the old understanding with the new one. You can use NLP technique to change the understanding and then the practice and repeated actions will change it if done with patience.