Bob, φιλεῖν (basically, "to have a liking for") is related to the noun φίλος, "friend," and denotes a feeling of comradeship and/or shared interests. The verb ἀγαπᾶν ("to love") denotes a feeling of deep affection, such as that between members of the same family. In the New Testament, it is contrasted sharply with its opposite, μισεῖν, in Matthew 5.43:
Ἠκούσατε ὅτι ἐρρέθη, Ἀγαπήσεις τὸν πλησίον σου καὶ μισήσεις τὸν ἐχθρόν σου. Ἐγὼ δὲ λέγω ὑμῖν, ἀγαπᾶτε τοὺς ἐχθροὺς ὐμῶν καὶ προσεύχεσθε ὑπὲρ τῶν διωκόντων ὑμᾶς.
"You have heard it said you will love the one closest to you and you will hate your enemy. But I say to you, love your enemies and pray for those who persecute you."