All christians are in some sense "saints", since the word implies a setting apart ... The Greek word for saint hagios comes from a root word that means not like anything else, different. Saints are different from the people of the world. They march to the tune of a different drummer. They are conformed to the will of God in Christ. As members of the Body of Christ, the Church, saints are the hands of God by which He accomplishes His work in the world today.
St. Symeon the New Theologian says that the reason vigil lights are placed before the icons of the saints is to show that without the Light, Who is Christ, the Saints are nothing. It is only as the light of Christ shines on them that they become alive and resplendent.
A saint is one who sees himself in the sins of others. A saint is one in whom Christ lives; one who opens his life to Christ and lives as Christ wills him to live. A saint is one who has been made actually what Baptism declares him to be, one set apart for God.
A saint is a mirror who reflects not himself but Christ.
The word "saint" is indeed biblical in its basis, as all members of the Church of Christ were classified as saints (little s). This draws the distinction in the usage of the word, there are two types of saints, capital "S" and little "s".
The difference is important:
"Thus, there are the Saints, with a capital “S,” those officially recognized and canonized by the Church, and there are the saints with a small “s,” who are the whole body of Christians-you and I included. We, too, are called to be men and women in whom others can in some way meet the living Christ. We can appreciate our call to be saints when we realize that saints become saints not so much because of the unusual things they do but rather because of the unusual degree to which they give themselves to Christ. By our daily faithfulness to Christ, each of us is a saint in the making. Made in the image of God and baptized in the Trinity, every Christian has the potential of sainthood."
All who profess Christ, whether they are Orthodox or not, can share of the fruit of the Holy Spirit "But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, meekness, temperance: against such there is no law." (Gal 5:22-23) but not all who profess Christ can be Saints, since to be a "saint" literally means "Holy One" as we have discussed. Something that is "Holy" has literally been converted into the Image and Likeness of God, and has been sanctified by His actual presence. It is not the "Gifts" of the Holy Spirit that sanctify the Saint but the "Holy Trinity living inside the Saint" that transforms them to "Holy".
We recognise the "holiness" of individuals who have struggled with a "holy" life that is above and beyond the average christian ...
In our Holy Liturgy the priest exclaims "Holy things are for the Holy" and then proceeds to break the Lamb.
This phrase includes all true (Orthodox) christians who struggle to be saved and are indwelt with the Holy Spirit.
So, when we refer to the "Saints" we call to mind those who "fought the good fight and finished the course and kept the faith" (cf. i Tim 4:7) and in so doing, have "laboured more abundantly than they all" (1 Cor 15:10).