"So the Lord, the living entity, material nature and time are all interrelated and are all eternal. However, the other item, karma, is not eternal."

Bhagavad-gita As It Is, Introduction

"Another name of the Paramatma feature of the Lord is kala, or eternal time. Eternal time is the witness of all our actions, good and bad, and thus resultant reactions are destined by Him. It is no use saying that we do not know why we are suffering. We may forget the misdeed for which we may suffer at this present moment, but we must remember that Paramatma is our constant companion and therefore He knows everything--past, present, and future. And because the Paramatma feature of Lord Krsna destines all actions and reactions, He is the supreme controller also. Without His sanction not a blade of grass can move. The living beings are given as much freedom as they deserve, and misuse of that freedom is the cause of suffering. The devotees of the Lord do not misuse their freedom, and therefore they are the good sons of the Lord. Others, who misuse freedom, are put into miseries destined by the eternal kala. The kala offers the conditioned souls both happiness and miseries. It is all predestined by eternal time. As we have miseries uncalled for, so we may have happiness also without being asked, for they are all predestined by kala. No one is therefore either an enemy or friend of the Lord. Everyone is suffering and enjoying the result of his own destiny. This destiny is made by the living beings in course of social intercourse. Everyone here wants to lord it over the material nature, and thus everyone creates his own destiny under the supervision of the Supreme Lord. He is all-pervading and therefore He can see everyone's activities. And because the Lord has no beginning or end, He is known also as the eternal time, kala."

Teachings of Queen Kunti, Chapter 11

"The complete universe is a manifestation of varieties of entities, beginning from the atoms up to the gigantic universe itself, and all is under the control of the Supreme Lord in His form of kala, or eternal time. The controlling time has different dimensions in relation to particular physical embodiments. There is a time for atomic dissolution and a time for the universal dissolution. There is a time for the annihilation of the body of the human being, and there is a time for the annihilation of the universal body. Also, growth, development and resultant actions all depend on the time factor."

Srimad-Bhagavatam 3:10:10 Purport

"Above the modes of nature is eternal time, which is called kala because it changes the shape of everything in the material world. Even if we are able to do something temporarily beneficial, time will see that the good project is frustrated in course of time. The only thing possible to be done is to get rid of eternal time, kala, which is compared to kala-sarpa, or the cobra snake, whose bite is always lethal. No one can be saved from the bite of a cobra. The best remedy for getting out of the clutches of the cobralike kala or its integrity, the modes of nature, is bhakti-yoga, as it is recommended in the Bhagavad-gita (14.26)."

Srimad-Bhagavatam 1:13:46 Purport

"If the spirit soul engages in the spiritual activities of devotional service, he is completely freed from the platform of birth and death. His next position is complete spiritual freedom from a material body. The fear of death is the action of the kala, or the time factor, which represents the influence of the Supreme Personality of Godhead. In other words, time is destructive. Whatever is created is subject to destruction and dissolution, which is the action of time. Time is a representation of the Lord, and it reminds us also that we must surrender unto the Lord. The Lord speaks to every conditioned soul as time. He says in Bhagavad-gita that if someone surrenders unto Him, then there is no longer any problem of birth and death. We should therefore accept the time factor as the Supreme Personality of Godhead standing before us."

Srimad-Bhagavatam 3:26:16 Purport

"Time is called kala--past, present and future. What is now present, tomorrow will be past, and what is now future, tomorrow will be present. But this past, present and future are the past, present and future of the body. We do not belong to the category of the past, present and future. We belong to the category of eternity. Therefore one should be concerned with how to attain or how to be elevated to the platform of eternity. The developed consciousness of the human being should be utilized not in the animal propensities of eating, sleeping, mating and defending but in searching out the valuable path which will help him get that life of eternity. It is said that the sun is taking away our duration of life--every minute, every hour, every day--but if we engage ourselves in the topics of Uttama-sloka, the topics of the Lord, that time cannot be taken away. The time one devotes in a Krsna consciousness temple cannot be taken away. It is an asset--a plus, not a minus. The duration of life, so far as the body is concerned, may be taken; however one tries to keep it intact, no one can do it. But the spiritual education we receive in Krsna consciousness cannot be taken away by the sun. It becomes a solid asset."

Easy Journey to Other Planets, Chapter 2

Bhaktivedanta Book Trust. HDG A.C. Bhaktivedanta Swami Srila Prabhupada.