Kawther is from the word kathrah meaning abundance and specifically an abundance of goodness. It is derived from a gift given to the Prophet of Allah peace be upon him that a pond/river of paradise which has a lot of goodness. It is derived from a gift given to the Prophet Muhammad peace be upon him that the pond/river of paradise which has a lot of goodness in the form of being sweeter than honey, whiter than milk and smells sweeter than musk.
It also has beautiful birds with extended necks for consumption and those that consume the birds are even more beautiful than these creatures. Its banks are of gold, it has many pearls on the side and its taste and texture of the river is divinely made and is full of abundant goodness.
Just as this pond/river has been gifted to the Prophet Muhammad peace be upon him in the hereafter and for his followers who are sincere and adhere to his laws set by Allah SWT. This abundant goodness is also how the Prophet peace be upon him was in the dunya providing abundant goodness to the people with two main aspects first being the Quran and second his Sunnah. Just as those who understand Quran and apply according to its given commands and stay away from the prohibitions with their due conditions.
This abundant knowledge, wisdom and nobility and all other forms of goodness contained within the words are designed to bring every believing muslim man and every believing muslim woman to have, make and spread abundant goodness in their lives, families and community. With the goodness found as an example in the Prophet peace be upon him life, it is essential to maintain discipline with bringing these words to each generation, teaching the children, people and especially oneself the immeasurable amount of wealth in the form of wisdom and knowledge that brings benefit to the above and makes a persons life of good character, good words and good actions that are designed to uplift the heart and make the person loved by the entire creation.
Kawther is only reserved for those who do not innovate, change or modify that which is complete and this can be found to be the Quran and Sunnah which is within its entirety total goodness and abundant love and complete way of life of Islam. The main point is to adhere to Quran and Sunnah as that will make one gifted with the drink of pond/river of Kawther in the hereafter which will remove all hunger and thirst for eternity and purify the aspects of the self and heart. Its vessels to drink are as great as the number of stars in the sky yet it would be ideal to drink from the hands of the Prophet peace be upon him.
A person must remember tawhid in worship, obedience and sacrifice. Praying only to Allah and sacrificing with only Allahs name for that which is permissible to eat of meat that is halal. So pray to Allah and sacrifice.
Those people that hate the Prophet peace be upon him they will be cut off from any goodness, their names forgotten and they will be unable to enjoy any aspect of life as all good is removed from their lives as hate for the Prophet peace be upon him destroys the person, their life, their name, their progeny and their soul is in torment for eternity suffering in the fires of Jahannum. So this hate that people have for the Prophet peace be upon him not only destroys them, but their families in this dunya and the hereafter resulting in from death to misery and pain and suffering for all eternity.
Perhaps people who hate the Prophet peace be upon him hate their own way of life as they cannot find any better way due to the superiority of the Quran over all other words and personality of the Prophet peace be upon him was the living, walking, talking Quran, that is sent as a guidance and mercy for all mankind. No other Prophet was sent for the entire mankind other than the beloved mercy for all creation the Prophet Muhammad peace be upon him.
The Quran is the absolute truth the spoken words of Allah SWT which has abundant goodness.