The highest good for humanity, the goal to which each person must direct all the powers of his spirit and body, is salvation. From this, it follows that the highest act of love for one's neighbours is to aid their salvation. In the Orthodox Christian Church - Christ's Kingdom, the kingdom of love - every member must be concerned first of all about his own salvation, and then about the salvation of all others.
Attaining to salvation is the true "reason for being" of all humanity. To this end, Christ our God has established and ordained His Church upon the earth and made Her the custodian of salvation, the guide and maintainer of the truth which leads to salvation.
Love for one's neighbour must consist first of all in striving for one's own salvation, for in doing this, one is able to reflect the truth and prepare oneself to witness it to others. Moreover, it is a direct deceit of Satan which leads many who are not struggling for their own salvation to begin trying to save others. Witnessing of Christ and His Holy Church is not, after all, an aggressive act, but is primarily an act of example, of striving with one's whole soul to fulfil the commands of the Orthodox Christian Church - which are precisely the commands of the Holy Scripture - and to save one's own soul. Our holy and God-bearing father, St Seraphim of Sarov has taught us, "Acquire the spirit of peace and a thousand will be saved around you."
Thus, striving diligently for one's own salvation is a great act of love for neighbour, for it helps him in his own salvation.
Zealously maintaining that truth which is vital to man's salvation, and proclaiming that truth is an act of great love for one's fellow humans. This too is primarily an act of striving to live that truth so that it will be manifested in oneself. Yet, we must realize that Satan is most anxious to pervert and destroy that truth so that no one will be saved. This is why the preservation of Orthodoxy is such a vital act of love - probably the most vital act of love which one can perform. It is love first of all for God (love demonstrated by humble obedience), and love for one's neighbour (love demonstrated by witnessing to the truth which is necessary for the salvation of his soul).
To undermine Orthodoxy, to lower it, to name it as "just one among the Christian denominations," to try to justify ecumenism in the name of an imaginary "unity of all mankind," is disdain and hatred. It is disdain for God demonstrated in self-willed disobedience and hatred of one's neighbour demonstrated by seeking to deprive him of the truth which leads to salvation.
Let us, Orthodox people, love God according to the way He has given us and love our neighbours with a godly love, according to the Scripture, disdaining the idle inventions of man's pride about a philosophical and worldly form of love which, as being of this world, destroys men's souls.