A resultful mediation is backup by the word of God and is a cautious action, that'swhy in Psalms 1 vs 2-3 ande us understand that when is based in the wordof Godit brings forth answers. That'swhy for any mediationpur focus will be based on the word of God which the bible talks about delight is in the law of the lord which is the word of God.
It should be done day and night with excuses of how busy our schedules are and one if the effect of mediation is it makes you useful at all times and your eyes are removed form what is happening in the world. Any one who mediate often easily hear from God through the scriptures
When you madiate you are inclined on how to populate the kingdom of God, how to be a blessing to people, things that will make God be happy with you.