Time is not a line but a dimension, like the dimensions of space. If you can bend space you bend time also, and if you knew enough and could move faster than light, you could travel backward in time and exist in two places at once.
Compassionate action -- balanced by wisdom -- is a very important component of spiritual life. It opens our heart and puts us in touch with the happiness that illuminates existence and gives us the strength and courage to continue on the path.