I bet I haven't mentioned before how much I love Elder Holland. :) I just watched his February 2015 CES Devotional speech. Such a powerful testimony, as usual. His talk starts at about 17 minutes of the video.
Some quotes from this talk that I managed to write down:
"...in nothing could I have more faith than I have in God the Eternal Father, in Jesus Christ, His Son, in their redeeming gospel and in their divinely guided Church. So what do we owe our students...? We owe them an uncompromised testimony and a life of good cheer. The Savior asked for that so often that I personally consider it a literal commandment. However, worry, and fear, and pessimism, and fretting can destroy anyone's good cheer. Yours and people around you. So put a smile on your face and cherish every day of your life."