William Burkitt on 2 Timothy 1:4

Observe here, The vehemency of affection which our apostle expresses towards Timothy; he desired, greatly desired, to see him, and with the sight of him to be filled with joy.

Note, That though we must love all Christians, with a sincere love, yet we may love some Christians with a more fervent love than others; choice and useful Christians, endearing and endeared friends, may and must be beloved above others: I desire greatly to see thee, &c.

Observe farther, St. Paul declares how mindful he was of Timothy's tears; perhaps a flood of tears were shed at their last parting one from another. The best of men have a propension to weeping, and upon occasion, have shed tears; so had Jacob, Joseph, David, and Christ himself. True goodness promotes compassion; good men ever have been, and are men of tender and compassionate dispositions.