Self-Denial

Sacrifice alone, bare and unrelieved, is ghastly, unnatural, and dead; but self-sacrifice, illuminated by love, is warmth and life; it is the death of Christ, the life of God, and the blessedness and only proper life of man. ---- F. W. Robertson

And He said to all, If anyone would come after me, let him deny himself and take up his cross daily and follow me. For whoever would save his life will lose it, but whoever loses his life for my sake will save it. For what does it profit a man if he gains the whole world and loses or or forfeits himself ?(Luke 9:23-26) 

A hymn to read, sing, hum, or whistle to the glory of Christ: JESUS, I MY CROSS HAVE TAKEN.

From the performance documentary Roots and Wings: The Story of Indelible Grace and the RUF Hymns

Rest

True rest is not that of torpor, but that of harmony; it is not refusing the struggle, but conquering in it; not resting from duty, but  finding rest in it. F. W. Robertson

Come to me, all who labor, and are heavy laden, and I will give you rest. Take my yoke upon you, and learn from me, for I am gentle and lowly in heart, and you will find rest for your souls. For my yoke is easy, and my burden is light. (Matthew 11:28-20). 

A hymn to read, sing, hum, or whistle to the glory of Him who is our rest: Jesus, I Am Resting, Resting