A vow is a solemn promise. It is a sacred covenant one makes to be fully committed and vested despite hardships, trials, or storms. It is not to be made lightly. “it is better to not make a vow than to break one” (Ecclesiastes 5:5). To break a vow demonstrates weakness of character.

This must be something that is significant to you

Only those things of supreme importance and significance can be deemed sacred. if something is sacred it is to be set apart. It is special. It is unlike any other. Thus, it must be guarded and kept with the utmost care.  Only those who truly love and have a demonstrable passion about something can make such a promise. Such a vow takes a commitment of the heart,soul, and mind.  It means giving your all until there is no more left to give. This must be something that you are bound to 

A covenant is a contract or an agreement solidified by word and deed. A covenant keeps a man earnest. Even when running, cowering, or giving up is the easiest option he or she considers the promise and the bond and gets up and soldiers on. He or she knows that the reward is great for the one who has practiced diligence. A man is only as good as his word.

This is the type of commitment you want to make. You want to invest all that is necessary to that and for that which you love.  Success is sure to result.