Decisions begin to have effect in our lives when we realise that they are seperate from our emotions..that they have the power to eventually align our emotions to them instead of them determining what our decisions should be. Decisions to walk in truth, to love unconditionally, to forgive, to work hard instead of  being lazy,to deny ones flesh, for some even to get born again are all tough and may not initially feel good but eventually if you stick to the decision,the feelings will line up with that decision and it will be effective.