"And you shall love the L-rd, your G-d"-Deuteronomy 6:5.
We are commanded to love G-d. We foster a love for G-d by studying and contemplating His Torah, His commandments, and His awesome deeds. Through studying and meditating about G-d we come to have somewhat of an understanding of His greatness-which automatically spawns a deep love for Him.
This mitzvah also includes sharing our knowledge of G-d with others, and calling upon our fellows to serve Him. After all, if we love G-d, we'd surely sing His praises before all who are ready to hear.
"You shall fear the L-rd, your G-d"-Deuteronomy 6:13.
We are commanded to fear G-d; never to be complacent, and to always bear in mind that transgressing His will leads to divine retribution.
This is also why we never say G-d's Name in vain - not in the context of a prayer or blessing - for this diminishes the fear and reverence we are commanded to harbor for Him.
"And I will be sanctified among the Children of Israel"-Leviticus 22:32.
We are commanded to sanctify G-d's holy Name by publicly proclaiming our faith and religion. In the event that a tyrant attempts to coerce us to renounce our belief in G-d, we are commanded to refuse to comply-even if the tyrant threatens to kill us. We may not even verbally deny our belief in G-d, though in our hearts we remain true to Him.
