You need to really love.

April 19
Let us pause a little in the virtue of love to God. What is this love? Before giving an answer to this question, it must be remembered that one is the substantial love God and love other accidental, and the latter in turn is distinguished in love accidental accidental sensible and spiritual love. Having made this distinction, we go now to answer the question above.
The substantial love God is simple and straightforward act of preference, with which God will put before all other reality, because of his infinite goodness. He who loves God thereby, love it with substantial charitable love. But if this love God joins substantial softness, if this softness is contained and it is all in the will, we then love spiritual accidental. If that gently descends further into the heart and feel with passion, with tenderness, we then love sensitive accidental.
  (January 9, 1915, to Raffaelina Cerase - Letters. II, p. 291)