“For the Christian man who mourns because of sin and because of the state of the world, there is this comfort—the comfort of the blessed hope, the glory that yet remains.
So that even here, though he is groaning, he is happy at the same time because of the hope that is set before him. There is this ultimate hope in eternity.
In that eternal state we shall be wholly and entirely blessed, there will be nothing to mar life, nothing to detract from it, nothing to spoil it.
Sorrow and sighing shall be no more; all tears shall be wiped away; and we shall bask for ever and ever in the eternal sunshine, and experience joy and bliss and glory unmixed and unspoiled. ‘Happy are they that mourn: for they shall be comforted.’
How true it is. Unless we know that, we are not Christian.
If we are Christian, we do know it, this joy of sins forgiven and the knowledge of it; the joy of reconciliation; the joy of knowing that God takes us back when we have fallen away from Him; the joy and contemplation of the glory that is set before us; the joy that comes from anticipation of the eternal state.
Let us, then, try to define this man who mourns. What sort of a man is he?
He is a sorrowful man, but he is not morose.
He is a sorrowful man, but he is not a miserable man.
He is a serious man, but he is not a solemn man.
He is a sober-minded man, but he is not a sullen man. He is a grave man, but he is never cold or prohibitive.
There is with his gravity a warmth and attraction. This man, in other words, is always serious; but he does not have to affect the seriousness.
The true Christian is never a man who has to put on an appearance of either sadness or joviality. No, no; he is a man who looks at life seriously; he contemplates it spiritually, and he sees in it sin and its effects.
He is a serious, sober-minded man. His outlook is always serious, but because of these views which he has, and his understanding of truth, he also has ‘a joy unspeakable and full of glory’.
So he is like the apostle Paul, ‘groaning within himself’, and yet happy because of his experience of Christ and the glory that is to come.
The Christian is not superficial in any sense, but is fundamentally serious and fundamentally happy.
You see, the joy of the Christian is a holy joy, the happiness of the Christian is a serious happiness.
None of that superficial appearance of happiness and joy! No, no; it is a solemn joy, it is a holy joy, it is a serious happiness; so that, though he is grave and sober-minded and serious, he is never cold and prohibitive.
Indeed, he is like our Lord Himself, groaning, weeping, and yet, ‘for the joy that was set before him’ enduring the cross, despising the shame.
That is the man who mourns; that is the Christian. That is the type of Christian seen in the Church in ages past, when the doctrine of sin was preached and emphasized, and men were not merely urged to take a sudden decision.
A deep doctrine of sin, a high doctrine of joy, and the two together produce this blessed, happy man who mourns, and who at the same time is comforted.
The way to experience that, obviously, is to read the Scriptures, to study and meditate upon them, to pray to God for His Spirit to reveal sin in us to ourselves, and then to reveal to us the Lord Jesus Christ in all His fullness.
‘Blessed are they that mourn: for they shall be comforted.’(Matt. 5:4)”
–D. Martyn Lloyd-Jones, Studies in the Sermon on the Mount, Second edition. (England: Inter-Varsity Press, 1976), 65-66.