The word "perfect" in the Scripture does not mean, as applied to a saint of God, anything approaching to the usual idea of perfection, as implying spotless, sinless holiness, but one who is matured and ripened in the life of God, no longer a child but a grown man. As a tree grown to its full stature is said to have attained perfection; so when the Lord the Spirit has brought forth the work of patience in your soul, as far as regards that work you are perfect, for it is God's work in you; and so far you are "entire," that is, possessing all which that grace gives, and "wanting nothing" which that grace can communicate.
To submit wholly to the will of God, and be lost and swallowed up in conformity to it, is the height of Christian perfection here below; and he that has that wants nothing, for he has all things in Christ. What, then, is the greatest height of grace to which the soul can arrive? Where did grace shine forth so conspicuously as in the Lord Jesus Christ? and where did grace manifest itself more than in the gloomy garden and on the suffering cross? Was not the human nature of Jesus more manifestly filled with the Spirit, and did not every grace shine forth in him more conspicuously in Gethsemane and on Calvary than when enraptured upon the Mount of Transfiguration?
So there is more manifested grace in the heart of a saint of God who, under trial and temptation, can say, "Thy will be done," and submit himself to the chastening rod of his heavenly Father, than when he is basking in the full beams of the Sun of righteousness. How often we are mistaken in this matter; longing for enjoyment, instead of seeing that true grace makes us submit to the will of God, whether in the valley or upon the mount!