In plain words
Do a bad deed, and you will not come to good; do a good deed, and you will not come to harm. Plant a lime, and will you see a mango? Will you see a lime when you have planted a mango?
Students!
Whatever seed we sow in the ground, that very seed grows into a plant, that very seed grows into a tree, and it gives us those very fruits. This is the nature of Prakṛti. It is the secret of creation. Whether anyone says no to it or says yes, this truth does not change. That is why every karma that man does has its result. As the karma, so the result. As the seed, so the plant. If the seed is one thing, the plant does not sprout as another.
That is why man is able to receive fruits that match the karmas he does. Each and every man should try to do good deeds and gain a good result. But the man of today longs greatly for the fruit of merit. Yet he does not step forward to do meritorious deeds. He forgets the fruit of sin. Yet he steps forward to do sinful deeds. This is the Ajñāna that is in man. It is not merely man's own influence. It is the influence of Prakṛti. That too takes part in this and in that way drives man along in many ways. Unable to share the pains, the troubles and the sorrows they go through: "O God! Why are You examining me like this, probing me like this?" So they plead with God. God does not hand out either happiness or sorrow. The happiness and sorrow you go through are the results of your own karmas, not gifts from God. God is the witness. God is just like a postman. Whatever cover comes for you, He hands you that cover. Whatever card comes, He hands it over. If a money order comes, He hands it over. But it is you who tear open the cover and receive the joys and sorrows inside it, not the postman. In the same way, you are going through the results of the good and bad you have done; they are not something God makes you go through, not something God hands you.