In plain words
By evil saṅkalpas a man comes to sorrow; by true saṅkalpas he becomes a sādhu; he alone who is free of all saṅkalpas attains Śānti. Do not forget such a good word as this.
Face is the index of mind. All the saṅkalpas and doubts in Manas are reflected in the face itself. Sorrow or joy, grief or anger or hatred, whatever the quality may be, it is reflected in the face. So man must give evil saṅkalpas no place in his heart. By evil saṅkalpas he comes to sorrow. Wishing others ill, doing others harm, resolving to hurt others: all such evil saṅkalpas not only harm others, but do still greater harm to the very one who wished it. Evil saṅkalpas are not man's natural qualities. When you throw a stone into a well, it starts there as a small ripple. This ripple spreads over the whole well. In the same way, when the stone called a saṅkalpa is thrown into this lake of man, the ripple starts in this lake of the mind through that stone, the saṅkalpa, and creeps into all the senses. When it enters the eyes, it sees with an evil eye. When it enters the ears, it listens only to evil. When it enters the mouth, it utters only evil feelings. Whether in the hands or the feet, the evil saṅkalpas creep through the whole body, and all of them do only evil deeds. Through the limbs, the hands and feet and the rest, and through evil saṅkalpas, it does only evil deeds. That is why by evil saṅkalpas one becomes evil.
What is the root cause of our sorrow? Our saṅkalpas themselves. These saṅkalpas themselves make all sorrows rise up out of us. So the moment saṅkalpas begin, you must enquire whether they are good saṅkalpas or evil ones, and put the evil saṅkalpas away from you as far as you can.