"Bhaav or भाव" is basically a Sanskrit word for "Feeling", "Emotion", "Mood" or "Devotional state of mind". English translation of "Bhaav" is "Spiritual Emotion". When such "Spiritual Emotion" is aroused in one's mind, it replaces the ego or ‘I'-ness in one’s life by the awareness of the existence of God. When one is in a state of Spiritual Emotion, one’s sub-conscious mind merges with the God for the time being & experiences communion with God. Spiritual Emotion is a state experienced in the Path of Devotion (Bhaktiyoga). During the state of "Bhaav" or "Spiritual Emotion" there is an intense awareness about the existence of God while carrying out day-to-day life activities. Spiritual Emotion is also a state of experiencing God’s presence everywhere.
Devotees of God generally live in the thought of God & live in a mood of ecstasy and self-surrender. Such devotees channel their emotional energies toward the God. Gopis of Vrindavan, including Radha Rani were of that devotional cult, who fell in Love with the God, Lord Krishna. Meerabai in recent times also considered Lord Krishna with such devotion only. Gopis & Radha's love for Lord Krishna was so strong that in His absence their mind always yearned for Him. Below are described the "Bhaav" or "Spiritual Emotions" of one Gopi who is yearning to meet God - Lord Krishna :
"O Krishna! You are Lord of my life. You always remain so in my life. O Lord, don't keep me out of your mind. O Lord, pl. don't forget me."
"O Krishna! My heart is crying for you, pl. do come. My soul is crying for you, pl. do come. O God, there is burning desire in my heart to meet you, pl. do come. Now pangs of separation are unbearable. Now even if I die Krishna, but see, even after death, my desire to meet you shall not die, as all my such desires are indestructible like You only. It shall live on forever till You meet me."
Sri Radha Rani is the greatest devotee of Lord Shri Krishna. It is said that Sri Radha is herself the "Devotional energy" of Lord Shri Krishna who is the Lord of the universe. Her name always comes before the name of Lord Krishna that is why God's one name is "Radha Krishna" also. As Sri Radha Rani is always in the thought of Lord Shri Krishna the Supreme God, so her state of "Spiritual Emotion" is called "Maha Bhaav or महाभाव" i.e. the highest state of Spiritual Emotion or Spiritual Ecstasy.
As per the Bhagwat Gita, devotion is the easiest method to develop "Bhaav" & get close to the God. God himself declares about the glory of devotion in Bhagwat Gita:
"man-mana bhava mad-bhakto
mad-yaji mam namaskuru
mam evaishyasi satyam te
pratijane priyo ’si me" (Bhagwat Gita: Chapter Eighteen verse 65)
"Sri Krishna says to Arjuna: Always think of Me, become My devotee, worship Me and offer your homage unto Me. Thus you will come to Me without fail. I promise you this because you are My very dear friend."
mam ekam saranam vraja
aham tvam sarva-papebhyo
mokshayisyami ma suchah" (Bhagwat Gita: Chapter Eighteen verse 66)
"Sri Krishna says to Arjuna: Abandon all varieties of religion and just surrender unto Me. I shall deliver you from all sinful reactions. Do not fear."
"ye tu dharmamritam idam
bhaktas te ’tiva me priyah" (Bhagwat Gita: Chapter Twelve verse 20)
"Sri Krishna said to Arjuna: O Arjuna, Those who follow this imperishable path of devotional service and who completely engage themselves with faith, making Me the supreme goal, are very, very dear to Me."
"mayy eva mana adhatsva
mayi buddhim nivesaya
nivasisyasi mayy eva
ata urdhvam na samsayah" (Bhagwat Gita: Chapter Twelve verse 8)
"Sri Krishna said: O Arjuna, Just fix your mind upon Me and engage all your intelligence in Me. Thus you will live in Me always, without a doubt."
So let's have devotion in God. Let's remember God for some time in our daily life so that we too can generate some "Bhaav" or "Spiritual Emotion" towards the God. Once that is developed, we shall always find God near us & our life shall be filled with joy, love & ecstasy.