You have asked about a serious and weighty matter, which none attain but very few of the righteous slaves of Allaah.
The love of Allaah is “the status for which the righteous compete and strive… It is the nourishment of hearts and souls… the delight of the eyes… It is the life of which one who is denied it is dead… the light which the one who loses it is in deep darkness… the healing of which the one who is denied is sick… the joy which the one who is deprived of it lives in distress and pain… 
It is the spirit of faith and good deeds… by means of which one may draw closer to Allaah… which, when it is absent, one is like a body in which there is no soul.”
O Allaah, make us among those whom You love.
The love of Allaah has signs and causes which are like the key to the door. These causes include the following:
1 –Following the guidance of the Prophet (peace and blessings of Allaah be upon him). Allaah says in His Holy Book (interpretation of the meaning):
 “Say (O Muhammad to mankind): If you (really) love Allaah, then follow me (i.e. accept Islamic Monotheism, follow the Qur’aan and the Sunnah), Allaah will love you and forgive you your sins. And Allaah is Oft-Forgiving, Most Merciful” [Aal ‘Imraan 3:31]
2-5 – Being humble towards the believers and stern towards the kaafirs, waging jihad for the sake of Allaah, and not fearing anyone or anything but Him. Allaah has mentioned these qualities in a single verse, in which He says (interpretation of the meaning):
 “O you who believe! Whoever from among you turns back from his religion (Islam), Allaah will bring a people whom He will love and they will love Him; humble towards the believers, stern towards the disbelievers, fighting in the way of Allaah, and never fear of the blame of the blamers” [al-Maa'idah 5:54]
In this verse Allaah describes the attributes of those whom He loves, the first of which is: humility and not being arrogant towards the Muslims, and being stern towards the kaafirs, and not humbling or humiliating oneself before them. They (the ones whom Allaah loves) strive for the sake of Allaah, against the Shaytaan, the kuffaar, the hypocrites and the evildoers, and they strive against their own selves (jihad al-nafs). They do not fear the blame of any blamer, because so long as they are following the commands of their religion, he will not care about anyone who mocks him or blames him.
6 – Doing naafil (supererogatory) acts of worship.  Allah says – according to a hadeeth qudsi – “My slave keeps drawing near to me by means of supererogatory acts of worship until I love Him.” Supererogatory acts of worship include naafil prayers, charity, ‘Umrah, Hajj and fasting.
8-12 – Loving, visiting one another, helping one another (financially) and offering sincere advice to one another for the sake of Allah.
These attributes were mentioned in a single hadeeth in which the Messenger (peace and blessings of Allaah be upon him) narrated that his Lord said: “My love is guaranteed for two who love one another for My sake; My love is guaranteed for two who visit one another for My sake; My love is guaranteed for two who help one another (financially) for My sake; My love is guaranteed to two who uphold ties with one another for My sake.”
What is meant by “two who visit one another for My sake” is that they only visit one another for the sake of Allah, seeking thereby His pleasure for their loving one another for His sake or cooperating in worshipping Him.
13 – Being tested. Calamities and disasters are a test for a person, and this is a sign that Allaah loves him, because this is like medicine: even though it is bitter, but still you offer the medicine, despite its bitterness, to the one whom you love; and Allah’s is the highest description. According to a saheeh hadeeth: “The greatest reward comes from the greatest trial. When Allah loves people, He tests them, and whoever accepts it gains the pleasure of Allah and whoever complains earns His wrath.
The scholars have explained that the one from whom calamities and trials are withheld is the hypocrite, for Allah withholds [his punishment] in this world, so as to bring him with all his sins on the Day of Resurrection.
If Allah loves you, do not ask about the good that you will attain and the virtue that you will acquire… it is sufficient for you to know that you are beloved of Allaah. The great fruits of the love of Allah for His slave are as follows:
1 – People will love him and he will be accepted on earth, as it says in the hadeeth narrated by al-Bukhaari (3209): “When Allah loves a slave, He says to Jibreel, 'I love so-and-so, so love him,' so Jibreel loves him and then calls out to the people of heaven, 'Allah loves so-and-so, so love him,' and the people of heaven love him, and then acceptance is placed in the Earth for him."
2 – What Allah has mentioned in the hadeeth qudsi of the great virtues of those whom He loves. It was narrated that Abu Hurayrah said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Whosoever shows enmity to someone devoted to Me, I shall be at war with him. My servant draws not near to Me with anything more loved by Me than the religious duties I have enjoined upon him, and My servant continues to draw near to Me with supererogatory works so that I shall love him. When I love him I am his hearing with which he hears, his seeing with which he sees, his hand with which he strikes and his foot with which he walks. Were he to ask [something] of Me, I would surely give it to him, and were he to ask Me for refuge, I would surely grant him it. I do not hesitate about anything as much as I hesitate about [seizing] the soul of My faithful servant: he hates death and I hate hurting him.” Narrated by al-Bukhaari, 6502.