Horatius Bonar 

“The object of the Christian ministry is to convert sinners and to edify the body of Christ. No faithful minister can possibly rest short of this. Applause, fame, popularity, honor, wealth-all these are vain. If souls are not won, if saints are not matured, our ministry itself is vain.

The question, therefore, which each of us has to answer to his own conscience is, ‘Has it been the end of my ministry, has it been the desire of my heart to save the lost and guide the saved? Is this my aim in every sermon I preach, in every visit I pay? Is it under the influence of this feeling that I continually live and walk and speak? Is it for this I pray and toil and fast and weep? Is it for this I spend and am spent, counting it, next to the salvation of my own soul, my chiefest joy to be the instrument of saving others? Is it for this that I exist? To accomplish this would I gladly die? Have I seen the

Nothing short of positive success can satisfy a true minister of Christ. His plans may proceed smoothly and his external machinery may work steadily, but without actual fruit in the saving of souls he counts all these as nothing. His feeling is: ‘My little children, of whom I travail in birth again until Christ be formed in you’ (Galatians 4:19). And it is this feeling which makes him successful”
– Horatius Bonar (1808-1889)
taken from: Words to Winners of Souls.