Christ commanded us to love one another as He has loved us. He taught us that His love is higher than natural love. One way He taught this was by giving us the command to love our enemies. It is not natural for us to love enemies. He showed us by His example [even to the Cross} that His love is sacrificial. Real love will do what is best for the other person no matter what the cost. This higher above-the-natural love is born from first loving God, which is the first and greatest commandment. The second commandment - to love thy neighbor - is utterly dependent on the fulfilling of the first commandment to love God above all else. To love thy neighbor is an automatic result of the fulfillment of the first commandment. If love of neighbor is lacking, then we know the first commandment has not been fulfilled.
The ecumenist love has a couple of things wrong with it. Love for God's Church and His Truth does not get its rightful first place. And the ecumenist does not consider us a "neighbor."
Archbishop Averky of blessed memory wrote:
More than anything on earth we value our Church's freedom. This is not at all because we do not have "love," as we are so superficially accused by the "ecumenists," who are themselves too full of "love" for the enemies of the pure and unadulterated Truth of Christ and, sometimes, even for open enemies of our holy faith [only for us, their brothers by blood and faith, have they no love!] Rather it is because we have a love of the Truth; because we firmly believe [having none of the doubts the ecumenists obviously have] that our Holy Orthodox Church is, as the Word of God teaches, the "pillar and ground of the Truth" [I Timothy 3:15]; and because we desire, as commanded by the holy Apostle, to "walk in Truth" [II John 4] and, following the warning of the great Father of the Church, St. Gregory the Theologian, we do not want to become betrayers of the teaching of the faith of the Truth," "communing of the leaven of the Evil One and joining ourselves to the plague-ridden ... apostates from Truth" [cf. Works of St. Gregory, Part I, p.12 in Russian]
Alexander Kalomiros describes the ecumenist love this way:
...Sugary, or unsalted and sentimental Christians regard [Orthodox eschatology] as extreme and repulsive pessimism. As allies with the world, they cannot see the seal of the devil on that which they approve. Neither can they estimate the horrendous gulf which separates the world from God, for then they would be required to admit that the same gulf separates them too from God.
They cannot, therefore, tolerate anyone being pessimistic about the contemporary Babel. They are that content with their era. They see such a bright future. Christianity for them is very much in step with the world, and they are so pleased with this that they will never forgive you if you show them that they are deceived.
They visualize in the future a united world-church with all men united by the bond of love. The heretics of the various sects are to them their Christian brothers from whom they were separated by the egotisms and narrow-mindedness of bygone eras. They admit that there are dogmatic differences, but these differences shall be overcome by love, or to speak more openly, they shall be forgotten by love.
But what relation does that sniveling love have to the love of God? How can they shamelessly claim that they have more love in their hearts than the Saints who were not able with their love to overcome the barriers which divided them from heresy, but on the contrary, they made these barriers higher so they could protect the sheep from the wolves?
But that which they take for love of men is in its essence nothing but love of the world. It is a coming to terms with falsehood by men who cannot bear the hardships of the war with the powers of darkness.
And their dream, that idyllic image of good and kindly people who make Christ reign on this earth -- that temptation of the desert -- is a dream condemned by the Lord Himself. [Against False Union, St. Nectarios Press, 1967, p. 65,66]