Doctrine and Covenants 98: 1-3 , 11-14, 22

How have you seen that your trials are working for your own good?

"1 Verily I say unto you my friends, fear not, let your hearts be comforted; yea, rejoice evermore, and in everything give thanks;

2 Waiting patiently on the Lord, for your prayers have entered into the ears of the Lord of Sabaoth, and are recorded with this seal and testament—the Lord hath sworn and decreed that they shall be granted.

3 Therefore, he giveth this promise unto you, with an immutable covenant that they shall be fulfilled; and all things wherewith you have been afflicted shall work together for your good, and to my name’s glory, saith the Lord.

11 And I give unto you a commandment, that ye shall forsake all evil and cleave unto all good, that ye shall live by every word which proceedeth forth out of the mouth of God.

12 For he will give unto the faithful line upon line, precept upon precept; and I will try you and prove you herewith.

13 And whoso layeth down his life in my cause, for my name’s sake, shall find it again, even life eternal.

14 Therefore, be not afraid of your enemies, for I have decreed in my heart, saith the Lord, that I will prove you in all things, whether you will abide in my covenant, even unto death, that you may be found worthy.

22 And again I say unto you, if ye observe to do whatsoever I command you, I, the Lord, will turn away all wrath and indignation from you, and the gates of hell shall not prevail against you." (Doctrine and Covenants 98: 1-3, 11-14, 22) 

And here's the beginning part of the commentary entitled: "My trials can work together for my good." : 

"Some of our challenges in life are caused by our own choices. Others are caused by the choices of others. And sometimes things just happen that are part of mortality. Regardless of the cause, adversity can help fulfill divine purposes as we turn to God."

Everything indeed has a purpose. Even trials or adversities have purposes. They are indeed working together for our own good, whether they are caused by our own choices or by the choices of others. And things just do happen as part of mortality. The divine purposes of adversities we are going through can indeed be fulfilled as we turn to God. In the first place, we experience them so we can remember our God and draw closer to Him. And as we turn to Him, He makes miracles happen to bring about His purposes, along with helping us reach our goals that align with His will.