There is no perfection ‘which does not admit of a continual increase.’ However far a Christian may advance in sanctification ‘he hath still need to ‘grow in grace’, and daily to advance in the knowledge and love of God His Saviour.’ The gradual development, then, still continues. It is conceived primarily as further growth in love on the plane of entire sanctification. The Christian life must either wax or wane. It is impossible for the Christian, even if fully sanctified, to stand still. ‘Yea, and when ye have attained a measure of perfect love, when God has circumcised your hearts, and enabled you to love him with all your heart and with all your soul, think not of resting there. That is impossible. You cannot stand still; you must either rise or fall; rise higher or fall lower. Therefore the voice of God to the children of Israel, to the children of God, is, ‘Go forward’! ‘Forgetting the things that are behind, and reaching forward unto those that are before, press on to the mark, for the prize of your high calling of God in Christ Jesus’!’ The Christian, even the fully sanctified Christian, must still face the possibility of being lost. Thus even such a one must still be admonished to give up his attachment to the world.
— Harald Lindström, “Sanctification and the Order of Salvation” Wesley and Sanctification (1949).