Question: It is said that there will not be sorrow in Paradise, but there will be regret. Are these two not opposed to each other?
ANSWER
There will be no sorrow or trouble in Paradise, nor will there be regrets like the regrets of the people of Hell. There will not be a monotonous life in Paradise, either. Many blessings that surpass our ability to imagine will exist, and the pleasure we will take from them will increase every moment. It is impossible to comprehend them by likening them to their worldly counterparts.

The inhabitants of Hell will grieve, saying, "We wish we had believed and attained the eternal blessings in Paradise." The inhabitants of Paradise, on the other hand, will say, "We wish we had performed more acts of worship and had risen to much higher ranks." Two hadith-i sharifs say (what means):

(The people of Paradise will not regret anything, except the time they spent without remembrance of Allah.) [Hakim]

(On the Day of Resurrection, everybody, sinful or pious, will have regrets. The sinful will regret that they did not quit sins and live religiously. The pious will regret that they did not perform many more acts of worship.) [Faraid-ul fawaid]

While a ruler was passing a place, he told his soldiers, "You can take from these stones." Some of them took stones, a few or a lot, in compliance with his order. Some others, however, did not take any stones so as not to carry loads. When they arrived at their country, they looked at stones they had taken and saw that all of them were precious stones. Just as those who did not take them had regrets, so those who took them had regrets. Those who took them regretted not taking a lot more, while those who took a lot of stones regretted not taking more. Surely, the regrets of those who took a lot of stones are not the same as the regrets of those who did not take any. Likewise, the regrets of a person who attains ever-increasing blessings in Paradise do not cause sorrow.

Seeing Hell
Question: Is it possible to see in the Hereafter the torment inflicted on those irreligious people who do not believe in the resurrection after death, Paradise, Hell, and who label Muslims as reactionaries?
ANSWER
Of course it is possible. In the interpretation of the Mutaffifin Sura's verses that say Believers will watch laughingly the torment inflicted on disbelievers, Hadrat Ka'b states the following:
(It is possible to watch Hell from Paradise. If a Believer wishes to see his enemy in Hell, [the sight will be brought before him immediately like a TV] he will be happy seeing the torment inflicted on his enemy.) [Tibyan]

Seeing the people in Hell and feeling sad
Question: A hadith-i sharif says, "It is possible to watch Hell from Paradise. If a Believer wishes to see an oppressive one in Hell, he will become happy seeing the torment inflicted on him." However, it is also reported that sorrow will not exist in Paradise. But if a person sees his/her cruel parents or cruel child in Hell being tormented, does he/she not become sad?
ANSWER
The states in the world are different from the states in the next world. Something that is unknown cannot be compared to something that is known. Since we will not have the nafs there, we will not have feelings stemming from it. Just as our sins that we repent of are forgiven and in the next world we will be made to forget those sins and never remember them again, so we will also be made to forget our relatives who will be in Hell. Thus, no case that will sadden us will arise. There is not disorder in Allahu ta'ala's deeds. Since He says, "There is no sorrow in Paradise," there will be no sorrow in any way whatsoever therein.

Paradise will be trouble free
Question: Will men have beards in Paradise? Will we take the trouble to shave our beards in Paradise as well?
ANSWER
Men will be beardless in Paradise. The trouble to shave or any other trouble will not exist therein. For example, there will be no need to urinate or defecate, either. Furthermore, people will not be charged with any acts of worship, such as praying or fasting. They will be granted unimaginable and unthinkable blessings. The meanings of two hadith-i sharifs about the beard are as follows:

(The people of Paradise will be beardless and will have black eyelashes.) [Tirmidhi]

(The people of Paradise will have kohl-rimmed eyes, will be beardless, and will have the beauty of Yusuf 'alaihis-salam.) [Ibn 'Asakir]

Everybody will be 33 years old in Paradise. When our Master the Prophet said to an old woman, "An old woman cannot enter Paradise," she began to cry. Thereupon, he said to her, "You will be young then" (Tirmidhi).

Everybody will be young
Question: I heard that those who die in childhood or old grandfathers will be young and 33 years old in Paradise. But the age of 33 is not considered a young age. Why will they not be 20 years old, but 33?
ANSWER
Of the community of our Prophet, very few people live beyond the age of 100. However, people of past communities used to live more than 1,000 years. In the eyes of them, 33 years of age was a very young age. Though 33 years of age is an old age in the eyes of teenagers, it is a young age for old people like us. Secondly, everybody will be the most beautiful, the most handsome in Paradise. No sorrow or trouble will exist therein in terms of age or any other matter.