In response to the question, "Which is the most important commandment?", Jesus appears to give two answers.  But in fact, He only gives one because He concludes by saying of the two commandments, "There is no commandment greater than these".  By using the singular, 'commandment', with the plural, 'these', He makes clear that the two commandments are one.  And more than that, these two summarise all the Old Testament laws.  Love for God and love for other human beings is indivisible.  Love comes from God.  It can only be shared because it has been received (1 John 4:19): and when it is received from God it has to be shared (1 John 4:20-21).  

Jesus went straight back to the Jewish daily prayer in Deuteronomy 6:4, "Hear, O Israel: the Lord our God, the Lord is one.  Love the Lord your God with all your heart and with all your soul and with all your strength."  He then added the command from Leviticus 19:18, "Do not seek revenge or bear a grudge against anyone among your people, but love your neighbour as yourself. I am the Lord."  By welding these two relationships together, the vertical and horizontal, Jesus also described His personal motivation for going to the cross: loving His Father and loving us.   

The Old Testament people were constrained by laws describing what pleases and displeases God.  Those laws are a framework for relationship, but are neither the motivation nor powerhouse of relationship.  God's plan is to have a family to love, a family who would love Him back, and then love each other.  In His kingdom, only He is supreme; everybody else should consider others as better than themselves (Philippians 2:3).  It is a family in which God is the centre (and not us), and in which we are to serve each other (1 Peter 4:10).  It is an environment in which there is no place for self-serving demanding egos - a place where the Lord is adored for who He is and those who adore Him, give Him and their neighbours their all!  Such a place would be heaven ... and it is!  

Our preparation for eternity with God is learned by taking our focus off ourselves and putting it, fully and gladly, onto the Lord; and with His love, onto others. The way we live now, marks how much we long for His presence. We do not estimate this by some mystical feeling, but by our devotion to our Saviour and our willingness to serve others for His sake.  The workplace is a good environment to practice!