"He that would be holy must fight. He must war a good warfare (1 Tim 1:18); fight the good fight of faith (1 Tim 6:12), though not with carnal weapons (2 Cor 10:4). He must fight upon his knees, being sober, and watching unto prayer (1 Pet 4:7). He must wrestle with principalities and powers, being strong in the Lord and the power of His might, having put on the whole armor of God, girdle, breastplate, shield, helmet and sword (Eph 6:13-17). This battle is not to the strong (Eccl 9:11), but to the weak; it is fought in weakness, and the victory is to them that have no might; for in this conflict time and chance do not happen to all; but we count upon victory from the first onset, being made more than conquerors through Him that loved us, and are cheered with the anticipation of the sevenfold reward "to him that overcometh" (Rev 2:7). Though, in this our earthly course and combat, we have the hostility of devils, we have the ministry of angels in aid (Heb 1:14), as well as the power of the Holy Ghost (Eph 1:13). "
-- Horatius Bonar, God's Way of Holiness