The way of the just is uprightness: thou, most upright, dost weigh the path of the just.
Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee.
To "weigh" the path means to make it smooth or level. At times it doesn't seem smooth and easy to do God's will, but we are never alone when we face tough times. God is there to help us through difficulties, to comfort us, and to lead us. He does this by giving us a purpose (keeping our mind centered on him,) and giving us provisions as we travel.
He provides us with relationships of family, friends and mentors. God gives us wisdom to make decisions and faith to trust him.